| Congress[a] | District | Original | Cause of vacancy | Winner | Date[b]
(linked to election article) |
|---|
| 1st | NH at-large | Benjamin West[c] (Pro-Admin) | Declined to serve | Abiel Foster (Pro-Admin) | June 22, 1789[d] |
| 1st | VA 9 | Theodorick Bland (Anti-Admin) | Died | William B. Giles (Anti-Admin) | July 1790[d] |
| 1st | CT at-large | Pierpont Edwards[e] (Pro-Admin) | Resigned | Jeremiah Wadsworth (Pro-Admin) | December 16, 1790[d] |
| 2nd | NY 1 | James Townsend[e] (Pro-Admin) | Died | Thomas Tredwell (Anti-Admin) | April 26–28, 1791[d] |
| 2nd | CT at-large | Roger Sherman (Pro-Admin) | Declined to serve | Amasa Learned (Pro-Admin) | September 19, 1791[d] |
| 2nd | MD 3 | William Pinkney (Pro-Admin) | Resigned | John Francis Mercer (Anti-Admin) | October 26–29, 1791[d] |
| 2nd | GA 1 | Anthony Wayne (Anti-Admin) | Disqualified | John Milledge (Anti-Admin) | July 9, 1792[d] |
| 2nd | MD 2 | Joshua Seney (Anti-Admin) | Resigned | William Hindman (Pro-Admin) | January 7–10, 1793[d] |
| 3rd | CT at-large | Jonathan Sturges[e] (Pro-Admin) | Resigned | Uriah Tracy (Pro-Admin) | April 8, 1793[d][f] |
| 3rd | CT at-large | Benjamin Huntington (Pro-Admin) | Declined to serve | Jonathan Ingersoll (Pro-Admin) | September 16, 1793[d] |
| 3rd | CT at-large | Stephen M. Mitchell (Pro-Admin)
Jonathan Ingersoll (Pro-Admin) | Declined to serve | Joshua Coit (Pro-Admin)
Zephaniah Swift (Pro-Admin) | November 11, 1793[d] |
| 3rd | MD 2 | John Francis Mercer (Anti-Admin) | Resigned | Gabriel Duvall (Anti-Admin) | May 5, 1794[d] |
| 3rd | SC 5 | Alexander Gillon (A) | Died October 6, 1794 | Robert Goodloe Harper (P) | October 13–14, 1794 |
| 3rd | MD 3 | Uriah Forrest (P) | Resigned | Benjamin Edwards (P) | December 8, 1794 |
| 3rd | NJ at-large | Abraham Clark (Pro-Admin) | Died September 15, 1794 | Aaron Kitchell (Pro-Admin) | January 11, 1795 |
| 4th | SC 2 | John Barnwell[e] (F) | Declined to serve | Wade Hampton (DR) | January 19–20, 1795[d] |
| 4th | CT at-large | Jonathan Trumbull[e] (F) | Resigned | Nathaniel Smith (F) | April 13, 1795[d] |
| 4th | NC 4 | Alexander Mebane (DR) | Died July 5, 1795 | Absalom Tatom (DR) | August 13–14, 1795[d] |
| 4th | MD 2 | Gabriel Duvall (DR) | Resigned March 28, 1796 | Richard Sprigg (DR) | April 18, 1796[d] |
| 4th | MA 10 | Benjamin Goodhue (F) | Resigned | Samuel Sewall (F) | September 12, 1796[d] |
| 4th | CT at-large | James Hillhouse (F) | Elected U.S. Senator May 12, 1796; resigned in the fall of 1796 | James Davenport (F) | September 19, 1796[d] |
| 4th | MD 3 | Jeremiah Crabb (F) | Resigned in 1796 after June 1 | William Craik (F) | October 3, 1796[d] |
| 4th | PA 5 | Daniel Hiester (DR) | Resigned | George Ege (F) | October 11, 1796[d] |
| 4th | RI at-large | Benjamin Bourne (F) | Resigned in October 1796 | Elisha R. Potter (F) | November 15, 1796[d] |
| 4th | MA 1 | Theodore Sedgwick (F) | Resigned in early June 1796 | Thomson J. Skinner (DR) | November 21, 1796[d] |
| 4th | NC 4 | Absalom Tatom (DR) | Resigned June 1, 1796 | William Strudwick (F) | November 23, 1796[d] |
| 4th | CT at-large | Uriah Tracy (F) | Resigned October 13, 1796 | Samuel W. Dana (F) | December 5, 1796[d] |
| 5th | RI at-large | Benjamin Bourne (F) | Resigned in October 1796 | Elisha R. Potter (F) | November 15, 1796[d] |
| 5th | CT at-large | Uriah Tracy[e] (F)
Zephaniah Swift (F) | Declined to serve | John Allen (F)
James Davenport (F) | April 10, 1797[d] |
| 5th | VT 2 | Daniel Buck (F) | Declined to serve | Lewis R. Morris (F) | May 23, 1797[d] |
| 5th | MA 11 | Theophilus Bradbury (F) | Resigned July 24, 1797 | Bailey Bartlett (F) | August 4, 1797[d] |
| 5th | NH at-large | Jeremiah Smith (F) | Resigned | Peleg Sprague (F) | August 28, 1797 |
| 5th | RI at-large | Elisha R. Potter (F) | Resigned in July 1797 | Thomas Tillinghast (F) | August 29, 1797[d] |
| 5th | SC 1 | William L. Smith (F) | Resigned July 10, 1797 | Thomas Pinckney (F) | September 4–5, 1797[d] |
| 5th | CT at-large | James Davenport (F) | Died August 3, 1797.[3] | William Edmond (F) | September 18, 1797[d] |
| 5th | PA 5 | George Ege (F) | Resigned in October 1797 | Joseph Hiester (DR) | October 10, 1797[d] |
| 5th | NH at-large | Jeremiah Smith (F) | Resigned June 26, 1797 | Peleg Sprague (F) | October 30, 1797[d] |
| 5th | NC 10 | Nathan Bryan (DR) | Died June 4, 1798 | Richard D. Spaight (DR) | August 2, 1798[d] |
| 5th | PA 1 | John Swanwick (DR) | Died August 1, 1798 | Robert Waln (F) | October 9, 1798[d] |
| 5th | PA 4 | Samuel Sitgreaves (F) | Resigned in 1798 | Robert Brown (DR) | October 9, 1798[d] |
| 5th | CT at-large | Joshua Coit (F) | Died September 5, 1798 | Jonathan Brace (F) | October 22, 1798[d] |
| 5th | VA 9 | William B. Giles (DR) | Resigned October 2, 1798 | Joseph Eggleston (DR) | November 1, 1798[d] |
| 6th | MD 7 | Joshua Seney[e] (DR) | Died October 20, 1798 | Joseph H. Nicholson (DR) | November 29, 1798[d] |
| 6th | CT at-large | John Allen (F) | Declined to serve | Elizur Goodrich (F) | September 16, 1799[d] |
| 6th | NH at-large | Peleg Sprague (F) | Declined to serve | James Sheafe (F) | November 18, 1799[d] |
| 6th | NY 1 | Jonathan N. Havens (DR) | Died October 25, 1799 | John Smith (DR) | December 27–29, 1799[d] |
| 6th | VA 13 | John Marshall (F) | Resigned | Littleton W. Tazewell (DR) | June 7, 1800 |
| 6th | NH at-large | William Gordon (F) | Resigned | Samuel Tenney (F) | August 25, 1800 |
| 6th | CT at-large | Jonathan Brace (F) | Resigned in May 1800 | John C. Smith (F) | September 15, 1800[d] |
| 6th | MA 10 | Samuel Sewall (F) | Resigned January 10, 1800 | Nathan Read (F) | October 20, 1800[d] |
| 6th | NH at-large | William Gordon (F) | Resigned | Samuel Tenney (F) | October 27, 1800[d] |
| 6th | MA 3 | Samuel Lyman (F) | Resigned November 6, 1800 | Ebenezer Mattoon (F) | December 15, 1800[d] |
| 6th | MA 4 | Dwight Foster (F) | Resigned | Levi Lincoln (DR) | December 15, 1800[d][f] |
| 6th | PA 8 | Thomas Hartley (F) | Died December 21, 1800 | John Stewart (DR) | January 15, 1801[d][f] |
| 7th | GA at-large | James Jones[e] (DR) | Died January 11, 1801 | John Milledge (DR) | March 23, 1801[d] |
| 7th | CT at-large | Elizur Goodrich[e] (F) | Resigned | Calvin Goddard (F) | April 9, 1801[d] |
| 7th | MA 14 | George Thatcher[c] (F) | Declined to seek re-election | Richard Cutts (DR) | June 22, 1801[d] |
| 7th | NC 8 | David Stone[e] (DR) | Resigned | Charles Johnson (DR) | August 6–7, 1801[d] |
| 7th | MA 4 | Levi Lincoln (DR) | Declined to serve | Seth Hastings (F) | June 22, 1801[d] |
| 7th | MA 14 | George Thatcher (F) | Declined to serve | Richard Cutts (DR) | June 22, 1801 |
| 7th | CT at-large | William Edmond[c] (F) | Declined to serve | Benjamin Tallmadge (F) | September 21, 1801[d] |
| 7th | MA 12 | Silas Lee (F) | Resigned | Vacant | September 25, 1801 |
| 7th | NC 8 | David Stone (F) | Resigned before the start of the 7th Congress | Charles Johnson (DR) | August 6, 1801 |
| 7th | NY 5 | Thomas Tillotson[c] (DR) | Resigned | Theodorus Bailey (DR) | October 6–8, 1801[d] |
| 7th | NY 6 | John Bird[c] (F) | Resigned July 25, 1801 | John P. Van Ness (DR) | October 6–8, 1801[d] |
| 7th | PA 4 | Peter Muhlenberg (DR) | Declined to serve | Isaac Van Horne (DR) | October 13, 1801[d] |
| 7th | PA 12 | Albert Gallatin (DR) | Declined to serve | William Hoge (DR) | October 13, 1801[d] |
| 7th | TN at-large | William C. C. Claiborne[c] (DR) | Resigned | William Dickson (DR) | October 29–30, 1801[d] |
| 7th | MD 2 | Richard Sprigg (DR) | Resigned April 11, 1802 | Walter Bowie (DR) | March 2, 1802[d] |
| 7th | GA at-large | Benjamin Taliaferro (DR) | Resigned | David Meriwether (DR) | April 5, 1802[d] |
| 7th | SC 4 | Thomas Sumter (DR) | Resigned | Richard Winn (DR) | April 12–13, 1802[d] |
| 7th | MA 12 | None | Failure to elect | Samuel Thatcher (F) | July 29, 1802[d] |
| 7th | NH at-large | Joseph Peirce (F) | Resigned | Samuel Hunt (F) | August 30, 1802[d] |
| 7th | NC 8 | Charles Johnson (DR) | Died July 23, 1802 | Thomas Wynns (DR) | October 15, 1802[d] |
| 8th | NY 7 | John Cantine[e] (F) | Declined to serve | Josiah Hasbrouck (DR) | April 26–28, 1803[d] |
| 8th | CT at-large | Elias Perkins[c] (F) | Declined to serve | Simeon Baldwin (F) | September 5, 1803[d] |
| 8th | NY 6 | Isaac Bloom[c] (DR) | Died | Daniel C. Verplanck (DR) | September 14–16, 1803[d] |
| 8th | GA at-large | John Milledge[e] (DR) | Milledge was elected Governor of Georgia | Joseph Bryan (DR) | October 3, 1803[d] |
| 8th | NY 1 | John Smith (DR) | Resigned | Samuel Riker (DR) | April 24–26, 1804[d] |
| 9th | NY 2 | Daniel D. Tompkins[e] (DR) | Declined to serve | Gurdon S. Mumford (DR) | September 11–13, 1804[d] |
| 8th | MA 12 | Thomson J. Skinner (DR) | Resigned | Simon Larned (DR) | September 17, 1804[d] |
| 8th | PA 10 | William Hoge (DR) | Resigned October 15, 1804 | John Hoge (DR) | November 2, 1804[d][f] |
| 8th | VA 13 | John Johns Trigg (DR) | Died | Christopher H. Clark (DR) | October 1804[d] |
| 8th | MD 4 | Daniel Hiester (DR) | Died | Roger Nelson (DR) | October 1, 1804[d] |
| 8th | VA 5 | Andrew Moore (DR) | Resigned | Alexander Wilson (DR) | November 13, 1804[d] |
| 8th | NY 3 | Samuel L. Mitchill (DR) | Resigned | George Clinton (DR) | January 2–4, 1805[d] |
| 9th | SC 8 | John B. Earle[c] (DR) | Declined to serve | Elias Earle (DR) | September 26–27, 1805[d] |
| 9th | NC 5 | James Gillespie[e] (DR) | Died | Thomas Kenan (DR) | August 8, 1805[d] |
| 9th | CT at-large | Calvin Goddard[c] (F) | Declined to serve | Timothy Pitkin (F) | September 16, 1805[d][f] |
| Roger Griswold[c] (F) | Declined to serve | Lewis B. Sturges (F) |
| 9th | DE at-large | James A. Bayard (F) | Declined to serve | James M. Broom (F) | October 1, 1805[d] |
| 9th | PA 4 | John A. Hanna (DR) | Died July 23, 1805 | Robert Whitehill (DR) | October 8, 1805[d] |
| 9th | PA 11 | John B. Lucas (DR) | Declined to serve | Samuel Smith (DR) | October 8, 1805[d] |
| 9th | NC 10 | Nathaniel Alexander[c] (DR) | Resigned | Evan S. Alexander (DR) | January 23–24, 1806[d] |
| 9th | GA at-large | Joseph Bryan (DR) | Resigned | Dennis Smelt (DR) | September 1, 1806[d][f] |
| 9th | CT at-large | John C. Smith (F) | Resigned | Theodore Dwight (F) | September 15, 1806[d] |
| 9th | MD 7 | Joseph H. Nicholson (DR) | Resigned | Edward Lloyd (DR) | September 27/October 4, 1806[d] |
| 9th | VA 13 | Christopher H. Clark (DR) | Resigned | William A. Burwell (DR) | November 1806[d] |
| 9th | PA 1 | Michael Leib (DR) | Resigned | John Porter (DR) | November 27, 1806[d] |
| 9th | GA at-large | Thomas Spalding (DR) | Resigned | William W. Bibb (DR) | December 1, 1806[d] |
| 10th | SC 6 | Levi Casey[e] (DR) | Died | Joseph C. Calhoun (DR) | June 1–2, 1807[d] |
| 10th | MA 12 | Barnabas Bidwell[c] (DR) | Resigned | Ezekiel Bacon (DR) | July 13, 1807[d] |
| 10th | DE at-large | James M. Broom (F) | Declined to serve | Nicholas Van Dyke (F) | October 6, 1807[d] |
| 10th | NC 7 | John Culpepper (F) | Seat declared vacant from January to February 1808 | John Culpepper (F) | February 1, 1808[d] |
| 10th | NJ at-large | Ezra Darby (DR) | Died | Adam Boyd (DR) | March 8–9, 1808[d] |
| 10th | NY 12 | David Thomas (DR) | Resigned | Nathan Wilson (DR) | April 26–28, 1808[d] |
| 10th | MA 2 | Jacob Crowninshield (DR) | Died | Joseph Story (DR) | May 4, 1808[d] |
| 10th | RI at-large | Nehemiah Knight (DR) | Died | Richard Jackson Jr. (F) | August 30, 1808[d] |
| 10th | VT 1 | James Witherell (DR) | Resigned | Samuel Shaw (DR) | September 6, 1808[d][f] |
| 10th | VA 17 | John Claiborne (DR) | Died | Thomas Gholson Jr. (DR) | September 8, 12, 26, 1808[d] |
| 10th | PA 1 | Joseph Clay (DR) | Resigned after March 28, 1808 | Benjamin Say (DR) | October 11, 1808[d] |
| 11th | PA 1 | Benjamin Say (DR) | Resigned in June 1809 | Adam Seybert (DR) | October 10, 1809[d][f] |
| 11th | VA 21 | Wilson C. Nicholas (DR) | Resigned | David S. Garland (DR) | December 1809[d] |
| 11th | NY 2 | William Denning[c] (DR) | Resigned | Samuel L. Mitchill (DR) | April 24–26, 1810[d] |
| 11th | KY 5 | Benjamin Howa (DR) | Resigned | William T. Barry (DR) | August 6, 1810[d] |
| 11th | CT at-large | Samuel W. Dana (F) | Resigned | Ebenezer Huntington (F) | September 17, 1810[d] |
| 11th | MD 4 | Roger Nelson (DR) | Resigned | Samuel Ringgold (DR) | October 1, 1810[d] |
| 11th | NJ at-large | James Cox (DR) | Died | John A. Scudder (DR) | October 30–31, 1810[d] |
| 11th | MA 10 | Jabez Upham (F) | Resigned | Joseph Allen (F) | October 8, 1810[d][f] |
| 11th | MA 11 | William Stedman (F) | Resigned | Abijah Bigelow (F) | October 8, 1810[d][f] |
| 11th | VA 1 | John G. Jackson (DR) | Resigned | William McKinley (DR) | November 1810[d] |
| 11th | MD 7 | John Brown (DR) | Resigned | Robert Wright (DR) | November 15, 1810[d] |
| 11th | SC 1 | Robert Marion (DR) | Resigned | Langdon Cheves (DR) | December 31, 1810[d][f] |
| 12th | MD 7 | John Brown[e] (DR) | Resigned before the close of the previous Congress | Robert Wright (DR) | November 15, 1810[d][g] |
| 12th | MD 6 | John Montgomery[c] (DR) | Resigned | Stevenson Archer (DR) | October 2, 1811[d] |
| 12th | MA 4 | Joseph B. Varnum[c] (DR) | Resigned | William M. Richardson (DR) | November 4, 1811[d][f] |
| 12th | MA 17 | Barzillai Gannett[c] (DR) | Resigned | Francis Carr (DR) | April 6, 1812[d][f] |
| 12th | GA at-large | Howell Cobb (DR) | Resigned before October 1812 | William Barnett (DR) | October 5, 1812[d][f] |
| 12th | NY 6 | Robert L. Livingston (F) | Resigned | Thomas P. Grosvenor (F) | December 15–17, 1812[d] |
| 12th | NC 3 | Thomas Blount (DR) | Died February 7, 1812 | William Kennedy (DR) | January 11, 1813[d] |
| 13th | PA 13 | John Smilie[e] (DR) | Died December 30, 1812 | Isaac Griffin (DR) | February 16, 1813[d] |
| 13th | OH 6 | John S. Edwards[e] (F) | Died | Reasin Beall (DR) | April 20, 1813[d] |
| 13th | NY 15 | William Dowse[e] (F) | Died | John M. Bowers[h] (F) | April 27–29, 1813[d] |
| 13th | KY 8 | John Simpson[e] (DR) | Died January 22, 1813 | Stephen Ormsby (DR) | April 29, 1813[d] |
| 13th | PA 15 | Abner Lacock[e] (DR) | Resigned March 3, 1813 | Thomas Wilson (DR) | May 4, 1813[d][f] |
| 13th | OH 3 | Duncan McArthur[c] (DR) | Declined to serve | William Creighton (DR) | May 10, 1813[d] |
| 13th | PA 5 | Robert Whitehill (DR) | Died April 8, 1813 | John Rea (DR) | May 11, 1813[d][f] |
| 13th | PA 3 | John Gloninger (F) | Resigned August 2, 1813 | Edward Crouch (DR) | October 12, 1813[d][f] |
| 13th | PA 7 | John M. Hyneman (DR) | Resigned August 2, 1813 | Daniel Udree (DR) | October 12, 1813[d][f] |
| 13th | GA at-large | William W. Bibb (DR) | Resigned | Alfred Cuthbert (DR) | December 13, 1813[d][f] |
| 13th | NY 2 | Egbert Benson (F) | Resigned | William Irving (DR) | December 28–30, 1813[d] |
| 13th | KY 2 | Henry Clay (DR) | Resigned | Joseph H. Hawkins (DR) | February 28, 1814[d] |
| 13th | MA 4 | William M. Richardson (DR) | Resigned | Samuel Dana (DR) | May 23, 1814[d] |
| 13th | VA 11 | John Dawson (DR) | Died | Philip P. Barbour (DR) | June 1814[d] |
| 13th | MA 12 | Daniel Dewey (F) | Resigned | John W. Hulbert (F) | August 4, 1814[d] |
| 13th | NH at-large | Samuel Smith (F) | Failure to elect.[i] | Vacant | August 29, 1814[d] |
| 13th | TN 5 | Felix Grundy (DR) | Resigned | Newton Cannon (DR) | September 15–16, 1814[d] |
| 13th | NJ 3 | Jacob Hufty [j] (F) | Died May 20, 1814 | Thomas Bines (DR) | October 10–11, 1814[d] |
| 13th | OH 6 | Reasin Beall (DR) | Resigned June 7, 1814 | David Clendenin (DR) | October 11, 1814[d][f] |
| 13th | PA 2 | Jonathan Roberts (DR) | Resigned February 24, 1814 | Samuel Henderson (F) | October 11, 1814[d][f] |
| 13th | PA 3 | James Whitehill (DR) | Resigned September 1, 1814 | Amos Slaymaker (F) | October 12, 1814[d][f] |
| 14th | NY 6 | Jonathan Fisk (DR) | Resigned | James W. Wilkin (DR) | April 1815 |
| 14th | NY 12 | Benjamin Pond (DR) | Died October 14, 1814 | Asa Adgate (DR) | April 1815 |
| 14th | VA 15 | Matthew Clay (DR) | Died May 27, 1815 | John Kerr (DR) | October 1815 |
| 14th | PA 1 | Jonathan Williams (DR) | Died May 16, 1815 | John Sergeant (F) | October 10, 1815 |
| 14th | PA 3 | Amos Ellmaker (DR) | Resigned July 3, 1815 | James M. Wallace (DR) | October 10, 1815 |
| 14th | PA 9 | David Bard (DR) | Died March 12, 1815 | Thomas Burnside (DR) | October 10, 1815 |
| 14th | TN 2 | John Sevier (DR) | Died September 24, 1815 | William G. Blount (DR) | December 7–8, 1815 |
| 14th | NC 6 | Nathaniel Macon (DR) | Resigned | Weldon N. Edwards (DR) | January 22, 1816 |
| 14th | MD 5 | Nicholas R. Moore (DR) | Resigned in 1815 | Samuel Smith (DR) | January 27, 1816 |
| 14th | NY 20 | Enos T. Throop (DR) | Resigned | Daniel Avery (DR) | September 1816 |
| 14th | MD 5 | William Pinkney (DR) | Pinkney was named Minister to Russia | Peter Little (DR) | September 3, 1816 |
| 14th | PA 9 | Thomas Burnside (DR) | Resigned in April 1816 | William P. Maclay (DR) | October 8, 1816 |
| 14th | VA 18 | Thomas Gholson Jr. (DR) | Died July 4, 1816 | Thomas M. Nelson (DR) | October 10–28, 1816 |
| 14th | KY 1 | James Clark (DR) | Resigned | Thomas Fletcher (DR) | December 2, 1816 |
| 14th | MD 3 | Alexander C. Hanson (F) | Resigned | George Peter (F) | December 2, 1816 |
| 14th | MA 11 | Elijah Brigham (F) | Died | Benjamin Adams (F) | December 2, 1816 |
| 14th | NC 8 | Richard Stanford (DR) | Died April 16, 1816 | Samuel Dickens (DR) | December 2, 1816 |
| 14th | OH 1 | John McLean (DR) | Resigned in April 1816 | William Henry Harrison (DR) | October 8, 1816 |
| 14th | GA at-large | Alfred Cuthbert (DR) | Resigned | Zadock Cook (DR) | December 1816 |
| 15th | PA 10 | David Scott (DR) | Resigned | John Murray (DR) | October 14, 1817 |
| 15th | CT at-large | Sylvanus Blackus (F)
Charles Dennison (F) | Died February 15, 1817 | Ebenezer Huntington (F)
Nathaniel Terry (F) | December 1, 1817 |
| 15th | NY 4 | Henry B. Lee (DR) | Died February 18, 1817 | James Tallmadge Jr. (DR) | December 1, 1817 |
| 15th | NC 7 | Alexander McMillan (F) | Died | James Stewart (F) | January 1, 1818 |
| 15th | SC 6 | John C. Calhoun (DR) | Resigned | Eldred Simkins (DR) | February 9, 1818 |
| 15th | PA 6 | John Ross (DR) | Resigned February 24, 1818 | Thomas J. Rogers (DR) | March 3, 1818 |
| 15th | PA 6 | Samuel D. Ingham (DR) | Resigned July 6, 1818 | Samuel Moore (DR) | October 13, 1818 |
| 15th | MA 20 | Albion Parris (DR) | Resigned | Enoch Lincoln (DR) | November 4, 1818 |
| 15th | NC 11 | Daniel M. Forney (DR) | Resigned | William Davidson (F) | November 7, 1818 |
| 15th | CT at-large | Uriel Holmes (F) | Resigned | Sylvester Gilbert (DR) | November 16, 1818 |
| 15th | PA 4 | Jacob Spangler (DR) | Resigned April 20, 1818 | Jacob Hostetter (DR) | November 16, 1818 |
| 15th | LA at-large | Thomas B. Robertson (DR) | Resigned | Thomas Butler (DR) | November 16, 1818 |
| 15th | VA 19 | Peterson Goodwyn (DR) | Died February 21, 1818 | John Pegram (DR) | November 16, 1818 |
| 15th | GA at-large | John Forsyth (DR) | Resigned | Robert R. Reid (DR) | January 4, 1819 |
| 16th | GA at-large | John Forsyth (DR) | Resigned | Robert R. Reid (DR) | January 4, 1819 |
| 16th | NJ at-large | John Condit (DR) | Resigned November 4, 1819 | Charles Kinsey (DR) | February 1–2, 1820 |
| 16th | MA 13 | Edward Dowse (DR) | Resigned | William Eustis (DR) | August 21, 1820 |
| 16th | PA 5 | David Fullerton (DR) | Resigned May 15, 1820 | Thomas G. McCullough (F) | October 10, 1820 |
| 16th | ME 1 | John Holmes (DR) | Resigned | Joseph Dane (F) | November 7, 1820 |
| 16th | VA 1 | James Pindall (F) | Resigned | Edward B. Jackson (DR) | November 13, 1820 |
| 16th | VA 10 | George F. Strother (DR) | Resigned | Thomas L. Moore (DR) | November 13, 1820 |
| 16th | VA 20 | James Johnson (DR) | Resigned | John C. Gray (DR) | November 13, 1820 |
| 16th | PA 7 | Joseph Hiester (DR) | Resigned in December 1820 | Daniel Udree (DR) | December 26, 1820 |
| 16th | NC 4 | Jesse Slocumb (DR) | Died December 20, 1820 | William S. Blackledge (DR) | February 7, 1821 |
| 17th | NJ at-large | John Linn (DR) | Died January 5, 1821 | Lewis Condict (DR) | October 8–9, 1821 |
| 17th | OH 4 | John C. Wright (DR) | Resigned March 3, 1821 | David Chambers (DR) | October 9, 1821 |
| 17th | PA 5 | James Duncan (DR) | Resigned in April 1821 | John Findlay (DR) | October 9, 1821 |
| 17th | PA 10 | William Cox Ellis (F) | Resigned July 20, 1821 | Thomas Murray Jr. (DR) | October 9, 1821 |
| 17th | NY 6 | Selah Tuthill (DR) | Died September 7, 1821 | Charles Borland Jr. (DR) | November 6–8, 1821 |
| 17th | SC 9 | John S. Richards (DR) | Declined to serve | James Blair (DR) | December 3, 1821 |
| 17th | KY 8 | Wingfield Bullock (DR) | Died October 13, 1821 | James D. Breckinridge (DR) | January 2, 1822 |
| 17th | NY 9 | Solomon Van Rensselaer (DR) | Resigned | Stephen Van Rensselaer (F) | February 25–27, 1822 |
| 17th | DE at-large | Caesar A. Rodney (DR) | Resigned January 24, 1822 | Daniel Rodney (F) | October 1, 1822 |
| 17th | PA 1 | William Milnor (F) | Resigned May 8, 1822 | Thomas Forrest (F) | October 1, 1822 |
| 17th | PA 6 | Samuel Moore (DR) | Resigned May 20, 1822 | Samuel D. Ingham (DR) | October 1, 1822 |
| 17th | PA 14 | Henry Baldwin (DR) | Died May 8, 1822 | Walter Forward (DR) | October 1, 1822 |
| 17th | IN at-large | William Hendricks (DR) | Resigned | Jonathan Jennings (DR) | December 2, 1822 |
| 17th | ME 2 | Ezekiel Whitman (F) | Resigned June 1, 1822 | Mark Harris (DR) | December 2, 1822 |
| 17th | PA 7 | Ludwig Worman (F) | Died October 17, 1822 | Daniel Udree (F) | December 10, 1822 |
| 17th | SC 9 | James Blair (DR) | Resigned | John Carter (DR) | December 11, 1822 |
| 17th | SC 2 | William Lowndes (DR) | Resigned May 8, 1822 | James Hamilton Jr. (DR) | January 6, 1823 |
| 17th | MD 5 | Samuel Smith (DR) | Resigned December 22, 1822 | Isaac McKim (DR) | January 8, 1823 |
| 18th | MD 5 | Samuel Smith (DR) | Resigned December 22, 1822 | Isaac McKim (Jackson DR) | January 8, 1823 |
| 18th | NY 28 | William B. Rochester (Adams DR) | Resigned | William Woods (Adams DR) | December 1, 1823 |
| 18th | VA 13 | William Lee Ball (Crawford DR) | Died February 29, 1824 | John Taliaferro (Crawford DR) | April 8, 1824[k] |
| 18th | PA 8 | Thomas J. Rogers (Jackson DR) | Resigned April 20, 1824 | George Wolf (Jackson DR) | October 12, 1824 |
| 18th | PA 13 | John Tod (Jackson DR) | Resigned | Alexander Thomson (Jackson DR) | October 12, 1824 |
| 18th | MA 10 | None[l] | (See note) | John Bailey (DR) | December 13, 1824 |
| 18th | VT at-large | Charles Rich (DR) | Died October 15, 1824 | Henry Olin (DR) | December 13, 1824[f] |
| 18th | IN 1 | William Prince (DR) | Died September 8, 1824 | Jacob Call (Jackson DR) | December 23, 1824[f] |
| 18th | NC 2 | Hutchins Gordon Burton (Crawford DR) | Resigned | George Outlaw (Crawford DR) | January 6, 1825 |
| 18th | GA at-large | Thomas W. Cobb (Crawford DR) | Resigned | Richard Henry Wilde (Crawford DR) | February 7, 1825 |
| 19th | PA 16 | James Allison Jr. (J) | Resigned | Robert Orr Jr. (J) | October 11, 1825 |
| 19th | PA 18 | Patrick Farrelly (J) | Died January 12, 1826 | Thomas H. Sill (NR) | March 14, 1826 |
| 19th | ME 5 | Enoch Lincoln (DR) | Resigned | James W. Ripley (J) | September 11, 1826 |
| 19th | OH 10 | David Jennings (NR) | Resigned May 25, 1826 | Thomas Shannon (NR) | October 10, 1826 |
| 19th | PA 2 | Joseph Hemphill (J) | Resigned May 1, 1826 | Thomas Kittera (NR) | October 10, 1826 |
| 19th | PA 7 | Henry Wilson (J) | Died August 14, 1826 | Jacob Krebs (J) | October 10, 1826 |
| 19th | PA 13 | Alexander Thomson (J) | Resigned May 1, 1826 | Chauncey Forward (J) | October 10, 1826 |
| 20th | ME 1 | William Burleigh (NR) | Died July 2, 1827 | Rufus McIntire (J) | September 10, 1827 |
| 20th | GA 1 | Edward Fenwick Tattnall[m] (J) | (See note) | George Rockingham Gilmer (J) | October 1, 1827 |
| 20th | DE at-large | Louis McLane (J) | Resigned | Kensey Johns Jr. (NR) | October 2, 1827 |
| 20th | OH 8 | William Wilson (NR) | Died June 6, 1827 | William Stanbery (J) | October 9, 1827 |
| 20th | PA 2 | None[n] | Previous election was tied | John Sergeant (NR) | October 9, 1827 |
| 20th | GA 2 | John Forsyth (J) | Resigned | Richard Henry Wilde (J) | November 17, 1827 |
| 20th | NJ at-large | George Holcombe (J) | Died January 4, 1828 | James F. Randolph (NR) | November 3–4, 1828 |
| 20th | NJ at-large | Hedge Thompson (NR) | Died July 23, 1828 | Thomas Sinnickson (NR) | November 3–4, 1828 |
| 20th | OH 6 | William Creighton (NR) | Resigned | Francis Swaine Muhlenberg (NR) | December 2, 1828 |
| 21st | ME 4 | Peleg Sprague (NR) | Resigned | George Evans (NR) | July 20, 1829 |
| 21st | PA 8 | Samuel D. Ingham (J)
George Wolf (J) | Ingham became U.S. Treasury Secretary March 6, 1829
Wolf was elected Governor of Pennsylvania | Peter Ihrie Jr. (J)
Samuel A. Smith (J) | October 13, 1829 |
| 21st | PA 16 | William Wilkins (J) | Resigned | Harmar Denny (Anti-M) | December 15, 1829 |
| 21st | OH 11 | John M. Goodenow (J) | Resigned April 9, 1830 | Humphrey H. Leavitt (J) | October 11, 1830 |
| 21st | ME 5 | James W. Ripley (J) | Resigned | Cornelius Holland (J) | December 6, 1830 |
| 22nd | VT 2 | Rollin Carolas Mallary (NR) | Died April 15, 1831 | William Slade (Anti-M) | November 1, 1831 |
| 22nd | PA 11 | William Ramsey (J) | Died September 29, 1831 | Robert McCoy (J) | November 22, 1831 |
| 22nd | VT 1 | Jonathan Hunt (NR) | Died May 15, 1832 | Hiland Hall (NR) | January 1, 1833 |
| 23rd | PA 1 | Joel B. Sutherland (J) | Resigned March 5, 1833 | Joel B. Sutherland (J)[o] | October 8, 1833 |
| 23rd | OH 19 | Humphrey H. Leavitt (J) | Resigned July 10, 1834 | Daniel Kilgore (J) | October 14, 1834 |
| 23rd | OH 1 | Robert T. Lytle (J) | Resigned March 10, 1834 | Robert T. Lytle (J) | November 8, 1834 |
| 23rd | VT 5 | Benjamin F. Deming (Anti-M) | Died July 11, 1834 | Henry Fisk Janes (Anti-M) | November 10, 1834 |
| 23rd | CT at-large
Seat A | William W. Ellsworth (NR) | Resigned July 8, 1834 | Joseph Trumbull (NR) | December 1, 1834 |
| 23rd | CT at-large
Seat B | Jabez W. Huntington (NR) | Resigned August 16, 1834 | Phineas Miner (NR) | December 1, 1834 |
| 23rd | CT at-large
Seat C | Samuel A. Foot (NR) | Resigned May 9, 1834 | Ebenezer Jackson Jr. (NR) | December 1, 1834 |
| 24th | PA 24 | John Banks (Anti-M) | Resigned April 2, 1836 | John J. Pearson (NR) | October 11, 1836 |
| 24th | PA 13 | Jesse Miller (J) | Resigned October 30, 1836 | James Black (J) | November 4, 1836 |
| 24th | NJ at-large | Philemon Dickerson (J) | Resigned November 3, 1836 | William Chetwood (W) | November 15–16, 1836 |
| 25th | PA 3 | Francis J. Harper (D) | Died March 18, 1837 | Charles Naylor (W) | June 29, 1837 |
| 25th | OH 17 | Andrew W. Loomis (W) | Resigned October 20, 1837 | Charles D. Coffin (W) | November 30, 1837 |
| 25th | PA 9 | Henry A. P. Muhlenberg (D) | Resigned February 9, 1838 | George M. Keim (D) | March 8, 1838 |
| 25th | ME 3 | Jonathan Cilley (D) | Killed February 24, 1838 | Edward Robinson (W) | April 28, 1838 |
| 25th | ME 5 | Timothy J. Carter (D) | Died March 14, 1838 | Virgil D. Parris (D) | May 29, 1838 |
| 25th | OH 16 | Elisha Whittlesey (W) | Resigned July 9, 1838 | Joshua Reed Giddings (W) | October 9, 1838 |
| 25th | OH 19 | Daniel Kilgore (D) | Resigned July 4, 1838 | Henry Swearingen (D) | November 5, 1838 |
| 26th | PA 14 | William W. Potter (D) | Died October 28, 1839 | George McCulloch (D) | November 20, 1839 |
| 26th | OH 4 | Thomas Corwin (W) | Resigned May 30, 1840 | Jeremiah Morrow (W) | October 13, 1840 |
| 26th | PA 22 | Richard Biddle (Anti-M) | Resigned May 13, 1840 | Henry M. Brackenridge (W) | October 13, 1840 |
| 26th | PA 13 | William S. Ramsey (D) | Died October 17, 1840 | Charles McClure (D) | November 20, 1840 |
| 27th | PA 13 | William S. Ramsey (D) | Died October 17, 1840 | Amos Gustine (D) | May 4, 1841 |
| 27th | PA 20 | Enos Hook (D) | Resigned April 18, 1841 | Henry W. Beeson (D) | May 25, 1841 |
| 27th | ME 4 | George Evans (W) | Resigned | David Bronson (W) | May 31, 1841 |
| 27th | PA 18 | Charles Ogle (W) | Died May 10, 1841 | Henry Black (W) | June 8, 1841 |
| 27th | PA 2 | John Sergeant (W) | Resigned September 15, 1841 | Joseph Reed Ingersoll (W) | October 12, 1841 |
| 27th | PA 18 | Henry Black (W) | Died November 28, 1841 | James M. Russell (W) | December 21, 1841 |
| 27th | PA 17 | Davis Dimock Jr. (D) | Died January 13, 1842 | Almon Heath Read (D) | March 1, 1842 |
| 27th | OH 16 | Joshua Reed Giddings (W) | Resigned March 22, 1842 | Joshua Reed Giddings (W) | April 26, 1842 |
| 27th | PA 21 | Joseph Lawrence (W) | Died April 17, 1842 | Thomas M. T. McKennan (W) | May 20, 1842 |
| 27th | MA 1 | Robert C. Winthrop (W) | Resigned | Nathan Appleton (W) | June 3, 1842 |
| Nathan Appleton (W) | Resigned September 28, 1842 | Robert C. Winthrop (W) | November 14, 1842 |
| 28th | PA 21 | William Wilkins (D) | Resigned February 14, 1844 | Cornelius Darragh (W) | March 15, 1844 |
| 28th | PA 13 | Henry Frick (W) | Died March 1, 1844 | James Pollock (W) | April 9, 1844 |
| 28th | OH 10 | Heman A. Moore (D) | Died April 3, 1844 | Alfred P. Stone (D) | October 8, 1844 |
| 28th | OH 21 | Henry R. Brinkerhoff (D) | Died April 30, 1844 | Edward S. Hamlin (D) | October 8, 1844 |
| 28th | PA 12 | Almon Heath Read (D) | Died June 3, 1844 | George Fuller (D) | October 8, 1844 |
| 29th | NJ 2 | Samuel G. Wright (W) | Died July 30, 1845 | George Sykes (D) | October 7–8, 1845 |
| 29th | FL at-large | David Levy Yulee (D) | Declined seat to become U.S. Senator from Florida | William Henry Brockenbrough (D) | October 6, 1845 |
| 29th | GA 3 | None[p] | (See note) | George W. Towns (D) | January 5, 1846 |
| 30th | OH 7 | Thomas L. Hamer (D) | Died December 2, 1846 | Jonathan D. Morris (D) | November 8, 1847 |
| 30th | PA 6 | John W. Hornbeck (W) | Died June 16, 1848 | Samuel A. Bridges (D) | February 23, 1848 |
| 31st | OH 6 | Rodolphus Dickinson (D) | Died March 20, 1849 | Amos E. Wood (D) | October 9, 1849 |
| 31st | VT 3 | George Perkins Marsh (W) | Resigned | James Meacham (W) | November 7, 1849 |
| 31st | GA 1 | Thomas Butler King (W) | Resigned | Joseph Webber Jackson (D) | February 4, 1850 |
| 31st | MA 1 | Robert C. Winthrop (W) | Resigned | Samuel A. Eliot (W) | August 22, 1850 |
| 31st | IA 1 | None | Seat declared vacant after contested election | Daniel F. Miller (W) | September 24, 1850 |
| 31st | NH 3 | James Wilson II (W) | Resigned September 9, 1850 | George W. Morrison (D) | October 8, 1850 |
| 31st | PA 15 | Henry Nes (W) | Died September 10, 1850 | Joel B. Danner (D) | October 8, 1850 |
| 31st | OH 6 | Amos E. Wood (D) | Died November 19, 1850 | John Bell (D) | December 23, 1850 |
| 31st | PA 11 | Chester P. Butler (W) | Died October 5, 1850 | John Brisbin (W) | December 31, 1850 |
| 32nd | ME 4 | Charles Andrews (D) | Died April 30, 1852 | Isaac Reed (W) | June 25, 1852 |
| 33rd | PA 8 | Henry A. Muhlenberg (D) | Died January 9, 1854 | J. Glancy Jones (D) | February 4, 1854 |
| 33rd | MA 1 | Zeno Scudder (W) | Declined to serve | Thomas D. Eliot (W) | April 17, 1854 |
| 34th | VT 1 | James Meacham (O) | Died August 23, 1856 | George Tisdale Hodges (R) | September 2, 1856 |
| 35th | PA 12 | John G. Montgomery (D) | Died April 24, 1857 | Paul Leidy (D) | October 13, 1857 |
| 35th | PA 8 | J. Glancy Jones (D) | Resigned October 30, 1858 | William H. Keim (R) | November 30, 1858 |
| 36th | OH 14 | Cyrus Spink (R) | Died May 31, 1859 | Harrison G. O. Blake (R) | October 11, 1859 |
| 36th | PA 8 | John Schwartz (ALD) | Died June 20, 1860 | Jacob K. McKenty (D) | October 9, 1860 |
| 36th | ME 5 | Israel Washburn Jr. (R) | Resigned January 1, 1861 | Stephen Coburn (R) | November 6, 1860 |
| 37th | OH 7 | Thomas Corwin (R) | Resigned March 12, 1861 | Richard A. Harrison (U) | May 28, 1861 |
| 37th | OH 13 | John Sherman (R) | Resigned March 21, 1861 | Samuel T. Worcester (R) | May 28, 1861 |
| 37th | PA 2 | Edward Joy Morris (R) | Resigned June 8, 1861 | Charles J. Biddle (UD) | June 21, 1861 |
| 37th | PA 12 | George W. Scranton (R) | Died March 24, 1861 | Hendrick Bradley Wright (UD) | June 21, 1861 |
| 37th | PA 7 | Thomas B. Cooper (D) | Died April 4, 1862 | John D. Stiles (D) | May 24, 1862 |
| 37th | ME 2 | Charles W. Walton (R) | Resigned | Thomas Fessenden (R) | December 1, 1862 |
| 38th | DE at-large | William Temple (D) | Died May 28, 1863 | Nathaniel B. Smithers (U) | November 19, 1863 |
| 40th | OH 2 | Rutherford B. Hayes (R) | Resigned July 20, 1867 | Samuel Fenton Cary (IR) | October 8, 1867 |
| 40th | PA 12 | Charles Denison (D) | Died June 27, 1867 | George W. Woodward (D) | October 8, 1867 |
| 40th | OH 8 | Cornelius S. Hamilton (R) | Killed December 22, 1867 | John Beatty (R) | January 27, 1868 |
| 40th | PA 9 | Thaddeus Stevens (R) | Died August 11, 1868 | Oliver J. Dickey (R) | October 13, 1868 |
| 40th | PA 20 | Darwin A. Finney (R) | Died August 25, 1868 | Solomon Newton Pettis (R) | October 13, 1868 |
| 41st | MA 7 | George S. Boutwell (R) | Resigned | George M. Brooks (R) | November 2, 1869 |
| 41st | OH 10 | Truman H. Hoag (D) | Died February 5, 1870 | Erasmus D. Peck (R) | April 5, 1870 |
| 41st | NC 4 | John T. Deweese (R) | Resigned | Robert B. Gilliam (D)[q] | August 4, 1870 |
| 41st | NC 4 | None | Died (see note above) | John Manning Jr. (D) | November 26, 1870 |
| 41st | SC 1 | Benjamin F. Whittemore (R) | Resigned | Joseph Rainey (R) | December 12, 1870 |
| 41st | GA 4 | Samuel F. Gove (R) | Elected, but not permitted to qualify | Jefferson F. Long (R) | December 22, 1870 |
| 42nd | OH 1 | Aaron F. Perry (R) | Resigned | Ozro J. Dodds (D) | October 8, 1872 |
| 42nd | GA 4 | Thomas J. Speer (R) | Died | Erasmus W. Beck (D) | October 29, 1872 |
| 42nd | PA 13 | Ulysses Mercur (R) | Resigned December 2, 1872 | Frank C. Bunnell (R) | December 24, 1872 |
| 43rd | OR 1 | Joseph G. Wilson (R) | Died July 2, 1873 | James Nesmith (D) | October 13, 1873 |
| 43rd | GA 8 | None[r] | (See note) | Alexander H. Stephens (D) | December 1, 1873 |
| 43rd | OR at-large | Joseph G. Wilson (R) | Died July 2, 1873 | James W. Nesmith (D) | December 1, 1873 |
| 43rd | OH 12 | Hugh J. Jewett (D) | Resigned June 23, 1874 | William E. Finck (D) | October 13, 1874 |
| 43rd | PA 23 | Ebenezer McJunkin (R) | Resigned January 1, 1875 | John M. Thompson (R) | November 3, 1874 |
| 44th | GA 9 | None[s] | (See note) | Benjamin Harvey Hill (D) | May 5, 1875 |
| 44th | ME 4 | Samuel F. Hersey (R) | Died February 3, 1875 | Harris M. Plaisted (R) | September 13, 1875 |
| 44th | OR at-large | None[t] | Died May 1, 1875 | Lafayette Lane (D) | October 25, 1875 |
| 44th | PA 12 | Winthrop W. Ketchum (R) | Resigned July 19, 1876 | William H. Stanton (D) | November 7, 1876 |
| 44th | ME 3 | James G. Blaine (R) | Resigned July 10, 1876 | Edwin Flye (R) | December 4, 1876 |
| 45th | GA 9 | None | Benjamin Harvey Hill (D) resigned | Hiram Parks Bell (D) | April 13, 1877 |
| 45th | NE at-large | Frank Welch (R) | Died September 4, 1878 | Thomas Jefferson Majors (R) | November 5, 1878 |
| 46th | GA 1 | Julian Hartridge (D) | Died January 8, 1879 | William Bennett Fleming (D) | February 10, 1879 |
| 46th | OH 19 | James A. Garfield (R) | Resigned November 8, 1880 | Ezra B. Taylor (R) | November 30, 1880 |
| 46th | NH 3 | Evarts Worcester Farr (R) | Died November 30, 1880. (Winner elected to finish term) | Ossian Ray (R) | December 28, 1880 |
| 47th | NH 3 | Evarts Worcester Farr (R) | Died November 30, 1880. (Winner elected to next term) | Ossian Ray (R) | December 28, 1880 |
| 47th | ME 2 | William P. Frye (R) | Resigned | Nelson Dingley Jr. (R) | September 12, 1881 |
| 47th | RI 1 | Nelson W. Aldrich (R) | Resigned | Henry J. Spooner (R) | November 22, 1881 |
| 47th | GA 8 | Alexander H. Stephens (D) | Resigned | Seaborn Reese (D) | November 8, 1882 |
| 47th | UT at-large | George Q. Cannon (R) | Seat declared vacant | John Thomas Caine (D) | November 8, 1882 |
| 47th | OH 16 | Jonathan T. Updegraff (R) | Died November 30, 1882 | Joseph D. Taylor (R) | January 2, 1883 |
| 48th | OH 17 | Jonathan T. Updegraff (R) | Died November 30, 1882 | Joseph D. Taylor (R) | January 2, 1883 |
| 48th | WV 3 | John E. Kenna (D) | Resigned | Charles P. Snyder (D) | May 15, 1883 |
| 48th | PA 19 | William A. Duncan (D) | Died November 14, 1884 | John A. Swope (D) | December 23, 1884 |
| 48th | RI 2 | Jonathan Chace (R) | Resigned | Nathan F. Dixon III (R) | February 5, 1885 |
| 49th | PA 19 | William A. Duncan (D) | Died November 14, 1884 | John A. Swope (D) | November 3, 1885 |
| 49th | RI 2 | William A. Pirce (R) | Candidate disqualified | Charles H. Page (D) | February 21, 1887 |
| 50th | NE 2 | James Laird (R) | Died August 17, 1889 | Gilbert L. Laws (R) | November 5, 1889 |
| 51st | PA 4 | William D. Kelley (R) | Died January 9, 1890 | John E. Reyburn (R) | February 18, 1890 |
| 51st | PA 3 | Samuel J. Randall (D) | Died April 13, 1890 | Richard Vaux (D) | May 20, 1890 |
| 52nd | SD at-large | John Rankin Gamble (R) | Died August 14, 1891 | John L. Jolley (R) | November 3, 1891 |
| 51st | AR 2 | John M. Clayton (R) | Was assassinated while contest was pending | Clifton R. Breckinridge (D) | November 4, 1890 |
| 51st | PA 27 | Lewis F. Watson (R) | Died August 25, 1890 | Charles W. Stone (R) | November 4, 1890 |
| 52nd | CA 3 | Joseph McKenna (R) | Resigned | Samuel G. Hilborn (R) | November 8, 1892 |
| 52nd | OH 16 | John G. Warwick (D) | Died August 14, 1892 | Lewis P. Ohliger (D) | November 8, 1892 |
| 52nd | PA 24 | Alexander K. Craig (D) | Died July 29, 1892 | William A. Sipe (D) | November 8, 1892 |
| 53rd | RI 2 | None | Failure to elect | Charles H. Page (D) | April 5, 1893 |
| 53rd | PA 8 | William Mutchler (D) | Died June 23, 1893 | Howard Mutchler (D) | August 7, 1893 |
| 53rd | MI 1 | J. Logan Chipman (D) | Died August 17, 1893 | Levi T. Griffin (D) | August 17, 1893 |
| 53rd | WI 4 | John L. Mitchell (D) | Declined to serve | Peter J. Somers (D) | August 27, 1893 |
| 53rd | OH 10 | William H. Enochs (R) | Died July 13, 1893 | Hezekiah S. Bundy (R) | November 5, 1893 |
| 53rd | PA 2 | Charles O'Neill (R) | Died November 25, 1893 | Robert Adams Jr. (R) | December 19, 1893 |
| 53rd | NY 14 | John R. Fellows (D) | Resigned | Lemuel E. Quigg (R) | January 30, 1894 |
| 53rd | VA 7 | Charles T. O'Ferrall (D) | Resigned | Smith S. Turner (D) | January 30, 1894 |
| 53rd | PA at-large | William Lilly (R) | Died December 1, 1893 | Galusha A. Grow (R) | January 20 or February 20, 1894 |
| 53rd | OH 3 | George W. Houk (D) | Died February 9, 1894 | Paul J. Sorg (D) | May 1, 1894 |
| 53rd | SC 1 | William H. Brawley (D) | Resigned | James F. Izlar (D) | February 12, 1894 |
| 53rd | LA 4 | Newton C. Blanchard (D) | Resigned | Henry W. Ogden (D) | March 12, 1894 |
| 53rd | MO 11 | Charles F. Joy (R) | Lost contested election | John J. O'Neill (D) | April 3, 1894 |
| 53rd | CA 3 | Samuel G. Hilborn (R) | Lost contested election | Warren B. English (D) | April 4, 1894 |
| 53rd | MD 1 | Robert F. Brattan (D) | Died | W. Laird Henry (D) | May 10, 1894 |
| 53rd | MD 5 | Barnes Compton (D) | Resigned | Charles E. Coffin (R) | May 15, 1894 |
| 53rd | KY 10 | Marcus C. Lisle (D) | Died July 7, 1894 | William M. Beckner (D) | July 7, 1894 |
| 53rd | KS 2 | Edward H. Funston (R) | Lost contested election | Horace L. Moore (D) | August 2, 1894 |
| 53rd | WI 7 | George B. Shaw (R) | Died August 27, 1894 | Michael Griffin (R) | August 27, 1894 |
| 53rd | AR 2 | Clifton R. Breckinridge (D) | Resigned | John S. Little (D) | November 1, 1894 |
| 53rd | OH 2 | John A. Caldwell (R) | Resigned May 4, 1894 | Jacob H. Bromwell (R) | November 6, 1894 |
| 53rd | AL 3 | William C. Oates (D) | Resigned | George P. Harrison (D) | November 30, 1894 |
| 53rd | NY 15 | Ashbel P. Fitch (D) | Resigned | Isidor Straus (D) | December 30, 1894 |
| 53rd | KY 9 | Thomas H. Paynter (D) | Resigned | Vacant | January 5, 1895 |
| 53rd | IL 10 | Philip S. Post (R) | Died January 6, 1895 | George W. Prince (R) | December 2, 1895 |
| 53rd | MI 3 | Julius C. Burrows (R) | Resigned | Vacant | January 13, 1895 |
| 53rd | PA 15 | Myron B. Wright (R) | Died November 13, 1894 | Edwin J. Jorden (R) | February 19, 1895 |
| 54th | PA 15 | Myron B. Wright (R) | Died November 13, 1894 | James H. Codding (R) | February 19, 1895 |
| 54th | GA 10 | James C. C. Black (D) | Succeeded himself to fill a vacancy he caused[5] | James C. C. Black (D) | October 2, 1895 |
| 54th | MA 6 | William Cogswell (R) | Died May 22, 1895 | William Henry Moody (R) | November 5, 1895 |
| 54th | NY 10 | None | Representative-elect Andrew J. Campbell (R) died December 6, 1894 | Amos J. Cummings (D) | November 5, 1895 |
| 54th | IL 10 | None | Philip S. Post (R) died January 6, 1895 | George W. Prince (R) | December 2, 1895 |
| 54th | IL 18 | Frederick Remann (R) | Died July 14, 1895 | William F. L. Hadley (R) | December 2, 1895 |
| 54th | MI 3 | Julius C. Burrows (R) | Resigned | Alfred Milnes (R) | December 2, 1895 |
| 54th | IL 3 | Lawrence E. McGann (D) | Lost election contest | Hugh R. Belknap (R) | December 27, 1895 |
| 54th | TX 11 | William H. Crain (D) | Died February 10, 1896 | Rudolph Kleberg (D) | April 7, 1896 |
| 54th | MO 5 | John C. Tarsney (D) | Lost election contest | Robert T. Van Horn (R) | February 27, 1896 |
| 54th | AL 4 | Gaston A. Robbins (D) | Lost election contest | William F. Aldrich (R) | March 12, 1896 |
| 54th | VA 5 | William R. McKenney (D) | Lost election contest | Robert T. Thorp (R) | May 2, 1896 |
| 54th | AL 5 | James E. Cobb (D) | Lost election contest | Albert T. Goodwyn (P) | April 21, 1896 |
| 54th | SC 7 | None | Seat declared vacant | J. William Stokes (D) | June 1, 1896 |
| 54th | NY 8 | James J. Walsh (D) | Lost election contest | John M. Mitchell (R) | June 2, 1896 |
| 54th | SC 1 | William Elliott (D) | Lost election contest | George W. Murray (R) | June 4, 1896 |
| 54th | IL 16 | Finis E. Downing (D) | Lost election contest | John I. Rinaker (R) | June 5, 1896 |
| 54th | NC 6 | James A. Lockhart (D) | Lost election contest | Charles H. Martin (P) | June 5, 1896 |
| 54th | AL 9 | Oscar W. Underwood (D) | Lost election contest | Truman H. Aldrich (R) | June 9, 1896 |
| 54th | LA 5 | None | Seat declared vacant after contested election | Charles J. Boatner (D) | June 10, 1896 |
| 54th | GA 3 | Charles Frederick Crisp (D) | Died October 23, 1896 | Charles R. Crisp (D) | December 19, 1896 |
| 54th | NY 19 | Frank S. Black (R) | Resigned | Vacant | January 7, 1897 |
| 54th | KY 10 | Joseph M. Kendall (D) | Lost election contest | Nathan T. Hopkins (R) | February 18, 1897 |
| 55th | PA 25 | James J. Davidson (R) | Died January 2, 1897 | Joseph B. Showalter (R) | April 20, 1897 |
| 55th | ME 3 | Seth L. Milliken (R) | Died April 18, 1897 | Edwin C. Burleigh (R) | June 21, 1897 |
| 55th | IN 4 | William S. Holman (D) | Died April 22, 1896 | Francis M. Griffith (D) | December 6, 1897 |
| 55th | SC 6 | John L. McLaurin (D) | Resigned | James Norton (D) | December 6, 1897 |
| 55th | MO 1 | None | Representative-elect Richard P. Giles (D) died November 17, 1896 | James T. Lloyd (D) | June 1, 1897 |
| 55th | IL 6 | Edward D. Cooke (R) | Died June 24, 1897 | Henry S. Boutell (R) | November 23, 1897 |
| 55th | MA 1 | Ashley B. Wright (R) | Died August 14, 1897 | George P. Lawrence (R) | November 2, 1897 |
| 55th | NY 3 | Francis H. Wilson (R) | Resigned | Edmund H. Driggs (D) | December 5, 1897 |
| 55th | AL 4 | Thomas S. Plowman (D) | Lost election contest | William F. Aldrich (R) | February 9, 1898 |
| 55th | PA 23 | William A. Stone (R) | Resigned | William H. Graham (R) | November 29, 1898 |
| 55th | VA 4 | Sydney P. Epes (D) | Lost election contest | Robert T. Thorp (R) | March 23, 1898 |
| 55th | MA 13 | John Simpkins (R) | Died March 27, 1898 | William S. Greene (R) | May 31, 1898 |
| 55th | VA 2 | William A. Young (D) | Lost election contest | Richard A. Wise (R) | April 26, 1898 |
| 55th | MS 2 | William V. Sullivan (D) | Resigned | Thomas Spight (D) | July 5, 1898 |
| 55th | OH 19 | Stephen A. Northway (R) | Died September 8, 1898 | Charles W. F. Dick (R) | November 8, 1898 |
| 55th | MS 6 | William F. Love (D) | Died October 16, 1898 | Frank A. McLain (D) | December 12, 1898 |
| 55th | NY 34 | Warren B. Hooker (R) | Resigned | Vacant | November 10, 1898 |
| 55th | TN 4 | Benton McMillin (D) | Resigned | Vacant | January 6, 1899 |
| 55th | NY 2 | Denis M. Hurley (R) | Died | Redistricted to NY 7 | February 26, 1899 |
| 56th | ME 2 | Nelson Dingley Jr. (R) | Died | Charles E. Littlefield (R) | June 19, 1899 |
| 56th | ME 1 | Thomas Brackett Reed (R) | Resigned | Amos L. Allen (R) | November 6, 1899 |
| 56th | NE 6 | William Laury Greene (Pop) | Died | William Neville (Pop) | November 7, 1899 |
| 56th | OH 16 | Lorenzo Danford (R) | Died June 19, 1899 | Joseph J. Gill (R) | November 7, 1899 |
| 56th | PA 9 | Daniel Ermentrout (D) | Died September 7, 1899 | Henry D. Green (D) | November 7, 1899 |
| 56th | UT at-large | Brigham Henry Roberts (D) | Disqualified | William H. King (D) | April 25, 1900 |
| 56th | CA 2 | Marion De Vries (D) | Resigned | Samuel D. Woods (R) | November 6, 1900 |
| 56th | DE at-large | John H. Hoffecker (R) | Died June 16, 1900 | Walter O. Hoffecker (R) | November 6, 1900 |
| 56th | NJ 7 | William D. Daly (D) | Died July 31, 1900 | Allan L. McDermott (D) | November 6, 1900 |
| 56th | PA 5 | Alfred C. Harmer (R) | Died March 6, 1900 | Edward de Veaux Morrell (R) | November 6, 1900 |
| 57th | ME 4 | Charles A. Boutelle (R) | Died | Llewellyn Powers (R) | April 8, 1901 |
| 57th | PA 10 | Marriott Brosius (R) | Died March 16, 1901 | Henry B. Cassel (R) | November 5, 1901 |
| 57th | NJ 4 | Joshua S. Salmon (D) | Died May 6, 1902 | De Witt C. Flanagan (D) | June 18, 1902 |
| 57th | PA 17 | Rufus King Polk (D) | Died March 5, 1902 | Alexander Billmeyer (D) | November 4, 1902 |
| 58th | OR 1 | Thomas H. Tongue (R) | Died | Binger Hermann (R) | June 1, 1903 |
| 58th | OH 16 | Joseph J. Gill (R) | Resigned October 31, 1903 | Capell L. Weems (R) | November 3, 1903 |
| 58th | PA 4 | Robert H. Foerderer (R) | Died July 26, 1903 | Reuben Moon (R) | November 3, 1903 |
| 58th | PA 3 | Henry Burk (R) | Died December 5, 1903 | George A. Castor (R) | February 16, 1904 |
| 58th | OH 14 | William W. Skiles (R) | Died January 9, 1904 | Amos R. Webber (R) | May 19, 1904 |
| 58th | OH 19 | Charles W. F. Dick (R) | Resigned March 23, 1904 | W. Aubrey Thomas (R) | May 19, 1904 |
| 58th | CA 3 | Victor H. Metcalf (R) | Resigned | Joseph R. Knowland (R) | November 8, 1904 |
| 58th | NJ 4 | William M. Lanning (R) | Resigned June 6, 1904 | Ira W. Wood (R) | November 8, 1904 |
| 59th | WV 2 | Alston G. Dayton (R) | Resigned | Thomas Beall Davis (D) | June 6, 1905 |
| 59th | NE 1 | Elmer Burkett (R) | Resigned | Ernest M. Pollard (R) | July 18, 1905 |
| 59th | CA 1 | James Gillett (R) | Resigned | William F. Englebright (R) | November 6, 1906 |
| 59th | GA 1 | Rufus E. Lester (D) | Died | James W. Overstreet (D) | November 6, 1906 |
| 59th | PA 2 | Robert Adams Jr. (R) | Died June 1, 1906 | John E. Reyburn (R) | November 6, 1906 |
| 59th | PA 3 | George A. Castor (R) | Died February 19, 1906 | J. Hampton Moore (R) | November 6, 1906 |
| 59th | PA 12 | George R. Patterson (R) | Died March 21, 1906 | Charles N. Brumm (R) | November 6, 1906 |
| 60th | PA 2 | John E. Reyburn (R) | Resigned March 31, 1907 | Joel Cook (R) | November 5, 1907 |
| 60th | ME 2 | Charles E. Littlefield (R) | Resigned | John P. Swasey (R) | November 3, 1908 |
| 60th | ME 4 | Llewellyn Powers (R) | Died | Frank E. Guernsey (R) | November 3, 1908 |
| 60th | SD at-large | William H. Parker (R) | Died | Eben Martin (R) | November 3, 1908 |
| 61st | OH 21 | Theodore E. Burton (R) | Resigned March 3, 1909 | James H. Cassidy (R) | April 20, 1909 |
| 61st | GA 2 | James M. Griggs (D) | Died | Seaborn Roddenbery (D) | February 6, 1910 |
| 62nd | PA 2 | Joel Cook (R) | Died December 15, 1910 | William S. Reyburn (R) | May 23, 1911 |
| 62nd | IA 9 | Walter I. Smith (R) | Resigned March 15, 1911 | William R. Green (R) | June 5, 1911 |
| 62nd | KS 2 | Alexander C. Mitchell (R) | Died July 7, 1911 | Joseph Taggart (D) | November 7, 1911 |
| 62nd | NE 3 | James P. Latta (D) | Died September 11, 1911 | Dan V. Stephens (D) | November 7, 1911 |
| 62nd | NJ 1 | Henry C. Loudenslager (R) | Died August 12, 1911 | William J. Browning (R) | November 7, 1911 |
| 62nd | PA 14 | George W. Kipp (D) | Died July 24, 1911 | William D. B. Ainey (R) | November 7, 1911 |
| 62nd | TN 10 | George Gordon (D) | Died August 9, 1911 | Kenneth McKellar (D) | November 7, 1911 |
| 62nd | PA 1 | Henry H. Bingham (R) | Died March 22, 1912 | William Scott Vare (R) | July 30, 1912 |
| 62nd | VT 1 | David J. Foster (R) | Died | Frank L. Greene (R) | July 30, 1912 |
| 62nd | NJ 6 | William Hughes (D) | Resigned September 12, 1912 | Archibald C. Hart (D) | November 5, 1912 |
| 63rd | NJ 6 | Lewis J. Martin (D) | Died May 5, 1913 | Archibald C. Hart (D) | July 22, 1913 |
| 63rd | ME 3 | Forrest Goodwin (R) | Died | John A. Peters (R) | September 9, 1913 |
| 63rd | WV 1 | John W. Davis (D) | Resigned | Matthew M. Neely (D) | October 14, 1913 |
| 63rd | GA 2 | Seaborn Roddenbery (D) | Died | Frank Park (D) | November 4, 1913 |
| 63rd | NJ 7 | Robert G. Bremner (D) | Died February 5, 1914 | Dow H. Drukker (R) | April 7, 1914 |
| 63rd | GA 10 | Thomas W. Hardwick (D) | Resigned | Carl Vinson (D) | November 3, 1914 |
| 63rd | NJ 9 | Walter I. McCoy (R) | Resigned October 3, 1914 | Richard W. Parker (R) | December 1, 1914 |
| 64th | PA 24 | William M. Brown (R) | Died January 31, 1915 | Henry W. Temple (R) | November 2, 1915 |
| 64th | WV 2 | William Gay Brown Jr. (D) | Died | George Meade Bowers (R) | May 9, 1916 |
| 64th | CA 10 | William Stephens (R) | Resigned | Henry S. Benedict (R) | November 7, 1916 |
| 64th | WV 4 | Hunter Holmes Moss Jr. (R) | Died | Harry C. Woodyard (R) | November 7, 1916 |
| 64th | GA 8 | Samuel Joelah Tribble (D) | Died | Tinsley W. Rucker Jr. (D) | January 11, 1917 |
| 65th | Charles H. Brand (D) |
| 64th | SC 5 | David E. Finley (D) | Died | Paul G. McCorkle (D) | February 21, 1917 |
| 65th | William F. Stevenson (D) |
| 65th | NH 1 | Cyrus A. Sulloway (R) | Died | Sherman Everett Burroughs (R) | May 29, 1917 |
| 65th | ND 1 | Henry Thomas Helgesen (R) | Died | John Miller Baer (R) | July 10, 1917 |
| 65th | PA 28 | Orrin D. Bleakley (R) | Resigned April 3, 1917 | Earl H. Beshlin (D) | November 6, 1917 |
| 65th | GA 4 | William C. Adamson (D) | Resigned | William C. Wright (D) | January 16, 1918 |
| 65th | NJ 5 | John H. Capstick (R) | Died March 17, 1918 | William F. Birch (R) | November 5, 1918 |
| 65th | OH 14 | Ellsworth Raymond Bathrick (D) | Died December 23, 1917 | Martin L. Davey (D) | November 5, 1918 |
| 65th | PA 22 | Edward E. Robbins (R) | Died January 25, 1919 | John H. Wilson (D) | March 4, 1919 |
| 66th | AK at-large | Charles August Sulzer (D) | Died during electoral recount | George Barnes Grigsby (D) | June 5, 1919 |
| 66th | OK 5 | Joseph Bryan Thompson (D) | Died September 18, 1919 | John W. Harreld (R) | November 8, 1919 |
| 66th | WI 5 | Victor L. Berger (S) | Unseated after disqualification | Victor L. Berger (S)[u] | December 19, 1919 |
| 66th | NJ 1 | William J. Browning (R) | Died March 24, 1920 | Francis F. Patterson Jr. (R) | November 2, 1920 |
| 66th | OK 8 | Dick Thompson Morgan (R) | Died July 4, 1920 | Charles Swindall (R) | November 2, 1920 |
| 66th | PA 3 | J. Hampton Moore (R) | Resigned January 4, 1920 | Harry C. Ransley (R) | November 2, 1920 |
| 67th | CA 9 | Charles F. Van de Water (R) | Died | Walter F. Lineberger (R) | February 15, 1921 |
| 67th | PA at-large | Mahlon M. Garland (R) | Died November 19, 1920 | Thomas S. Crago (R) | September 20, 1921 |
| 67th | ME 3 | John A. Peters (R) | Resigned | John E. Nelson (R) | March 20, 1922 |
| 67th | HI at-large | Jonah Kūhiō Kalaniana'ole (R) | Died | Henry Alexander Baldwin (R) | March 25, 1922 |
| 67th | CA 6 | John A. Elston (R) | Died | James H. MacLafferty (R) | November 7, 1922 |
| 67th | IL at-large | William E. Mason (R) | Died June 16, 1921 | Winnifred Huck (R) | November 7, 1922 |
| 67th | NE 1 | C. Frank Reavis (R) | Resigned | Roy H. Thorpe (R) | November 7, 1922 |
| 67th | NE 6 | Moses Kinkaid (R) | Died | Augustin Reed Humphrey (R) | November 7, 1922 |
| 68th | CA 5 | John I. Nolan (R) | Died | Mae Nolan (R) | January 23, 1923 |
| 68th | NY 19 | None | Representative-elect Samuel Marx (D) died | Sol Bloom (D) | January 30, 1923 |
| 68th | CA 10 | Henry Z. Osborne (R) | Died | John D. Fredericks (R) | May 1, 1923 |
| 68th | VT 2 | Porter H. Dale (R) | Resigned | Ernest Willard Gibson (R) | November 6, 1923 |
| 68th | IL 2 | Vacant | Rep. James R. Mann died during previous congress | Morton D. Hull (R) | April 3, 1923 |
| 68th | CA 10 | Vacant | Rep. Henry Z. Osborne died during previous congress | John D. Fredericks (R) | May 1, 1923 |
| 68th | NY 16 | Vacant | Rep. Bourke Cockran died during previous congress | John J. O'Connor (D) | November 6, 1923 |
| 68th | AL 2 | John R. Tyson (D) | Died | J. Lister Hill (D) | August 14, 1923 |
| 68th | MI 3 | John M. C. Smith (R) | Died | Arthur B. Williams (R) | June 19, 1923 |
| 68th | IA 8 | Horace M. Towner (R) | Resigned April 1, 1923 | Hiram K. Evans (R) | June 4, 1923 |
| 68th | NY 11 | Daniel J. Riordan (D) | Died April 28, 1923 | Anning S. Prall (D) | November 6, 1923 |
| 68th | IL 4 | John W. Rainey (D) | Died May 4, 1923 | Thomas A. Doyle (D) | November 6, 1923 |
| 68th | AR 6 | Lewis E. Sawyer (D) | Died May 5, 1923 | James B. Reed (D) | October 6, 1923 |
| 68th | WA 5 | J. Stanley Webster (R) | Resigned May 8, 1923 | Samuel B. Hill (D) | September 25, 1923 |
| 68th | NC 2 | Claude Kitchin (D) | Died May 31, 1923 | John H. Kerr (D) | November 6, 1923 |
| 68th | NY 32 | Luther W. Mott (R) | Died July 10, 1923 | Thaddeus C. Sweet (R) | November 6, 1923 |
| 68th | VT 2 | Porter H. Dale (R) | Resigned August 11, 1923 | Ernest Willard Gibson (R) | November 6, 1923 |
| 68th | KY 7 | J. Campbell Cantrill (D) | Died September 2, 1923 | Joseph W. Morris (D) | November 30, 1923 |
| 68th | NY 24 | James V. Ganly (D) | Died September 7, 1923 | Benjamin L. Fairchild (R) | November 6, 1923 |
| 68th | MS 3 | Benjamin G. Humphreys II (D) | Died October 16, 1923 | William Y. Humphreys (D) | November 27, 1923 |
| 68th | ND 2 | George M. Young (R) | Resigned | Thomas Hall (R) | November 4, 1924 |
| 69th | MA 5 | John Jacob Rogers (R) | Died | Edith Nourse Rogers (R) | June 30, 1925 |
| 69th | NJ 3 | T. Frank Appleby (R) | Died December 15, 1924 | Stewart H. Appleby (R) | November 3, 1925 |
| 69th | KY 10 | John W. Langley (R) | Resigned | Andrew J. Kirk (R) | February 13, 1926 |
| 69th | CA 2 | John Raker (D) | Died | Harry Englebright (R) | August 31, 1926 |
| 69th | CA 5 | Lawrence Flaherty (R) | Died | Richard Welch (R) | August 31, 1926 |
| 70th | OR 3 | Maurice Crumpacker (R) | Died | Franklin Korell (R) | October 18, 1927 |
| 70th | OH 2 | Ambrose E. B. Stephens (R) | Died February 12, 1927 | Charles Tatgenhorst Jr. (R) | November 8, 1927 |
| 70th | PA 1 | James M. Hazlett (R) | Resigned October 20, 1927 | James M. Beck (R) | November 8, 1927 |
| 70th | OR 2 | Nicholas Sinnott (R) | Resigned | Robert Butler (R) | November 6, 1928 |
| 70th | PA 8 | Thomas S. Butler (R) | Died May 26, 1928 | James Wolfenden (R) | November 6, 1928 |
| 71st | AR 2 | William Allan Oldfield (D) | Died November 19, 1928 | Pearl Oldfield (D) | January 9, 1929 |
| 71st | PA 12 | John J. Casey (D) | Died May 5, 1929 | C. Murray Turpin (R) | June 4, 1929 |
| 71st | GA 5 | Leslie Steele (D) | Died | Robert Ramspeck (D) | October 2, 1929 |
| 71st | AR 4 | Otis Wingo (D) | Died | Effiegene Wingo (D) | November 4, 1930 |
| 71st | PA 32 | Stephen G. Porter (R) | Died June 27, 1930 | Edmund F. Erk (R) | November 4, 1930 |
| 71st | RI 3 | Jeremiah O'Connell (D) | Resigned | Francis Condon (D) | November 4, 1930 |
| 71st | UT 2 | Elmer O. Leatherwood (R) | Died | Frederick Loofbourow (R) | November 4, 1930 |
| 71st | WV 4 | James Hughes (R) | Died | Robert Hogg (R) | November 4, 1930 |
| 72nd | NY 7 | John Quayle (D) | Died November 27, 1930 | Matthew V. O'Malley[v] (D) | February 17, 1931 |
| 72nd | GA 1 | Charles Edwards (D) | Died | Homer Parker (D) | September 9, 1931 |
| 72nd | NY 7 | Matthew V. O'Malley (D) | Died May 26, 1931 | John J. Delaney (D) | November 3, 1931 |
| 72nd | OH 1 | Nicholas Longworth (R) | Died April 9, 1931 | John B. Hollister (R) | November 3, 1931 |
| 72nd | OH 20 | Charles A. Mooney (D) | Died May 29, 1931 | Martin L. Sweeney (D) | November 3, 1931 |
| 72nd | PA 2 | George Scott Graham (R) | Died July 4, 1931 | Edward L. Stokes (R) | November 3, 1931 |
| 72nd | NJ 5 | Ernest R. Ackerman (R) | Died October 18, 1931 | Percy Hamilton Stewart (D) | December 1, 1931 |
| 72nd | NH 1 | Fletcher Hale (R) | Died | William Rogers (D) | January 5, 1932 |
| 72nd | GA 6 | Samuel Rutherford (D) | Died | Carlton Mobley (D) | March 2, 1932 |
| 72nd | PA 20 | J. Russell Leech (R) | Resigned January 29, 1932 | Howard W. Stull (R) | April 26, 1932 |
| 72nd | TN 7 | Edward E. Eslick (D) | Died June 14, 1932 | Willa Eslick (D) | August 14, 1932 |
| 72nd | GA 3 | Charles Crisp (D) | Resigned | Bryant Castellow (D) | November 8, 1932 |
| 72nd | PA 6 | George A. Welsh (R) | Resigned May 31, 1932 | Robert L. Davis (R) | November 8, 1932 |
| 72nd | PA 18 | Edward M. Beers (R) | Died April 21, 1932 | Joseph F. Biddle (R) | November 8, 1932 |
| 73rd | GA 10 | Charles Brand (D) | Died | Paul Brown (D) | July 5, 1933 |
| 73rd | AZ at-large | Lewis Douglas (D) | Resigned | Isabella Greenway (D) | October 3, 1933 |
| 73rd | PA 9 | Henry W. Watson (R) | Died August 27, 1933 | Oliver W. Frey (D) | November 7, 1933 |
| 73rd | WV 3 | Lynn Hornor (D) | Died | Andrew Edmiston (D) | November 28, 1933 |
| 73rd | NY 34 | John D. Clarke (R) | Died November 5, 1933 | Marian W. Clarke (R) | December 28, 1933 |
| 73rd | VT at-large | Ernest Gibson (R) | Resigned | Charles Plumley (R) | January 16, 1934 |
| 73rd | LA 6 | Bolivar Kemp (D) | Died | Jared Sanders (D) | May 1, 1934 |
| 74th | RI 1 | Francis Condon (D) | Resigned | Charles Risk (R) | August 6, 1935 |
| 74th | OH at-large | Charles V. Truax (D) | Died August 9, 1935 | Daniel S. Earhart (D) | November 3, 1936 |
| 74th | OH 11 | Mell G. Underwood (D) | Resigned April 10, 1936 | Peter F. Hammond (D) | November 3, 1936 |
| 75th | CA 5 | Henry Stubbs (D) | Died | Alfred Elliott (D) | May 4, 1937 |
| 75th | PA 18 | Benjamin K. Focht (R) | Died March 27, 1937 | Richard M. Simpson (R) | May 11, 1937 |
| 75th | OK 5 | Robert P. Hill (D) | Died October 29, 1937 | Gomer Griffith Smith (D) | December 10, 1937 |
| 75th | SC 6 | Allard H. Gasque (D) | Died June 17, 1938 | Elizabeth Gasque (D) | September 13, 1938 |
| 75th | OH 4 | Frank Kloeb (D) | Resigned August 19, 1937 | Walter Albaugh (R) | November 8, 1938 |
| 76th | GA 4 | Emmett Owen (D) | Died | Albert Camp (D) | August 1, 1939 |
| 76th | SC 1 | Thomas S. McMillan (D) | Died | Clara G. McMillan (D) | November 7, 1939 |
| 76th | PA 4 | J. Burrwood Daly (D) | Died March 12, 1939 | John E. Sheridan (D) | November 7, 1939 |
| 76th | OH 17 | William A. Ashbrook (D) | Died January 1, 1940 | J. Harry McGregor (R) | February 27, 1940 |
| 76th | OH 22 | Chester C. Bolton (R) | Died October 29, 1939 | Frances P. Bolton (R) | February 27, 1940 |
| 76th | NE 1 | George Heinke (R) | Died | John Sweet (R) | April 19, 1940 |
| 76th | ME 2 | Clyde Smith (R) | Died | Margaret Chase Smith (R) | June 3, 1940 |
| 76th | GA 8 | Benjamin Gibbs (D) | Died | Florence Reville Gibbs (D) | October 1, 1940 |
| 77th | OK 7 | Sam C. Massingale (D) | Died January 17, 1941 | Victor Wickersham (D) | April 1, 1941 |
| 77th | MD 6 | William D. Byron (D) | Died in a plane crash February 27, 1941 | Katharine Byron (D) | May 27, 1941 |
| 77th | PA 15 | Albert G. Rutherford (R) | Died August 10, 1941 | Wilson D. Gillette (R) | November 4, 1941 |
| 77th | MS 2 | Wall Doxey (D) | Resigned | Jamie Whitten (D) | November 4, 1941 |
| 77th | PA 12 | J. Harold Flannery (D) | Resigned January 3, 1942 | Thomas B. Miller (R) | May 19, 1942 |
| 77th | PA 33 | Joseph A. McArdle (D) | Resigned January 5, 1942 | Elmer J. Holland (D) | May 19, 1942 |
| 77th | CA 17 | Lee Guyer (D) | Died | Cecil King (D) | August 25, 1942 |
| 77th | PA 11 | Patrick J. Boland (D) | Died May 18, 1942 | Veronica Boland (D) | November 3, 1942 |
| 78th | CA 2 | Harry Englebright (R) | Died | Clair Engle (D) | August 31, 1943 |
| 78th | PA 23 | James E. Van Zandt (R) | Resigned September 24, 1943 | D. Emmert Brumbaugh (R) | November 2, 1943 |
| 78th | PA 2 | James McGranery (D) | Resigned November 17, 1943 | Joseph Pratt (R) | January 18, 1944 |
| 78th | PA 17 | J. William Ditter (R) | Died in a plane crash November 21, 1943 | Samuel K. McConnell Jr. (R) | January 18, 1944 |
| 78th | OK 2 | John Conover Nichols (D) | Resigned July 3, 1943 | William G. Stigler (D) | March 28, 1944 |
| 78th | NY 11 | James O'Leary (D) | Died March 16, 1944 | Ellsworth Buck (R) | June 6, 1944 |
| 78th | SC 2 | Hampton P. Fulmer (D) | Died | Willa L. Fulmer (D) | November 7, 1944 |
| 79th | MT 2 | James O'Connor (D) | Died January 15, 1945 | Wesley D'Ewart (R) | June 5, 1945 |
| 79th | NJ 4 | D. Lane Powers (R) | Resigned August 30, 1945 | Frank A. Mathews Jr. (R) | November 6, 1945 |
| 79th | OR 1 | James Mott (R) | Died November 12, 1945 | Walter Norblad (R) | January 18, 1946 |
| 79th | GA 5 | Robert Ramspeck (D) | Resigned | Helen Douglas Mankin (D) | February 12, 1946 |
| 79th | PA 33 | Samuel A. Weiss (D) | Resigned January 7, 1946 | Frank Buchanan (D) | May 21, 1946 |
| 79th | NC 8 | William O. Burgin (D) | Died | Eliza Pratt (D) | May 25, 1946 |
| 79th | PA 10 | John W. Murphy (D) | Resigned July 17, 1946 | James P. Scoblick (R) | November 5, 1946 |
| 80th | AL 8 | John Sparkman (D) | Resigned November 5, 1946 | Robert E. Jones Jr. (D) | January 28, 1947 |
| 80th | WI 2 | Robert Henry (R) | Died November 20, 1946 | Glenn Davis (R) | April 22, 1947 |
| 80th | WA 3 | Fred B. Norman (R) | Died April 18, 1947 | Russell V. Mack (R) | June 7, 1947 |
| 80th | MD 3 | Thomas D'Alesandro Jr. (D) | Resigned May 16, 1947 | Edward Garmatz (D) | July 15, 1947 |
| 80th | TX 9 | Joseph J. Mansfield (D) | Died July 12, 1947 | Clark W. Thompson (D) | August 23, 1947 |
| 80th | TX 16 | R. Ewing Thomason (D) | Resigned July 31, 1947 | Kenneth M. Regan (D) | August 23, 1947 |
| 80th | MI 11 | Fred Bradley (R) | Died May 24, 1947 | Charles E. Potter (R) | August 26, 1947 |
| 80th | PA 8 | Charles L. Gerlach (R) | Died May 5, 1947 | Franklin H. Lichtenwalter (R) | September 9, 1947 |
| 80th | IN 10 | Raymond S. Springer (R) | Died August 28, 1947 | Ralph Harvey (R) | November 4, 1947 |
| 80th | NY 14 | Leo F. Rayfiel (D) | Resigned September 13, 1947 | Abraham J. Multer (D) | November 4, 1947 |
| 80th | OH 4 | Robert Jones (R) | Resigned | William McCulloch (R) | November 4, 1947 |
| 80th | MA 9 | Charles L. Gifford (R) | Died August 23, 1947 | Donald W. Nicholson (R) | November 18, 1947 |
| 80th | NY 24 | Benjamin J. Rabin (D) | Resigned December 31, 1947 | Leo Isacson (AL) | February 17, 1948 |
| 80th | VA 4 | Patrick Drewry (D) | Died December 21, 1947 | Watkins Abbitt (D) | February 17, 1948 |
| 80th | KY 2 | Earle Clements (D) | Resigned January 6, 1948 | John Whitaker (D) | April 17, 1948 |
| 80th | KY 9 | John Robsion (R) | Died February 17, 1948 | William Lewis (R) | April 24, 1948 |
| 80th | MO 10 | Orville Zimmerman (D) | Died April 7, 1948 | Paul C. Jones (D) | November 2, 1948 |
| 80th | VA 6 | J. Lindsay Almond (D) | Resigned April 17, 1948 | Clarence G. Burton (D) | November 2, 1948 |
| 80th | TX 15 | Milton H. West (D) | Died October 28, 1948 | Lloyd Bentsen (D) | December 4, 1948 |
| 81st | NY 7 | John J. Delaney (D) | Died November 18, 1948 | Louis B. Heller (D) | February 15, 1949[6] |
| 81st | NY 20 | Sol Bloom (D) | Died March 7, 1949 | Franklin D. Roosevelt Jr. (Lib) | May 17, 1949[7] |
| 81st | PA 26 | Robert L. Coffey (D) | Died April 20, 1949 | John P. Saylor (R) | September 13, 1949 |
| 81st | CA 5 | Richard Welch (R) | Died | Jack Shelley (D) | November 8, 1949 |
| 81st | NY 10 | Andrew Lawrence Somers (D) | Died | Edna F. Kelly (D) | November 8, 1949 |
| 81st | NJ 7 | J. Parnell Thomas (R) | Resigned January 2, 1950 | William B. Widnall (R) | February 6, 1950 |
| 81st | TX 18 | Eugene Worley (D) | Resigned April 3, 1950 | Ben H. Guill (R) | May 6, 1950 |
| 81st | KY 6 | Thomas R. Underwood (D) | Resigned March 17, 1951 | John C. Watts (D) | April 4, 1951 |
| 82nd | WV 5 | John Kee (D) | Died | Elizabeth Kee (D) | July 17, 1951 |
| 82nd | PA 33 | Frank Buchanan (D) | Died April 27, 1951 | Vera Buchanan (D) | July 24, 1951 |
| 82nd | ME 3 | Frank Fellows (R) | Died | Clifford McIntire (R) | October 22, 1951 |
| 82nd | NJ 9 | Harry L. Towe (R) | Resigned September 7, 1951 | Frank C. Osmers Jr. (R) | November 6, 1951 |
| 82nd | OH 3 | Edward G. Breen (D) | Resigned October 1, 1951 | Paul F. Schenck (R) | November 6, 1951 |
| 82nd | PA 8 | Albert C. Vaughn (R) | Died September 1, 1951 | Karl C. King (R) | November 6, 1951 |
| 82nd | PA 14 | Wilson D. Gillette (R) | Died August 7, 1951 | Joseph L. Carrigg (R) | November 6, 1951 |
| 82nd | NE 3 | Karl Stefan (R) | Died | R. D. Harrison (R) | December 4, 1951 |
| 83rd | GA 2 | E. Eugene Cox (D) | Died | J. L. Pilcher (D) | February 4, 1953 |
| 83rd | NJ 6 | Clifford P. Case (R) | Resigned August 16, 1953 | Harrison A. Williams (D) | November 3, 1953 |
| 83rd | CA 24 | Norris Poulson (R) | Resigned | Glenard P. Lipscomb (R) | November 10, 1953 |
| 83rd | HI at-large | Joseph R. Farrington (R) | Died | Mary Elizabeth Pruett Farrington (R) | July 31, 1954 |
| 83rd | GA 4 | A. Sidney Camp (D) | Died | John Flynt (D) | November 2, 1954 |
| 84th | FL 6 | Dwight L. Rogers (D) | Died December 1, 1954 | Paul Rogers (D) | January 11, 1955 |
| 84th | MI 15 | John Dingell Sr. (D) | Died | John Dingell (D) | December 13, 1955 |
| 84th | PA 30 | Vera Buchanan (D) | Died November 26, 1955 | Elmer J. Holland (D) | January 24, 1956 |
| 84th | PA 2 | William T. Granahan (D) | Died May 25, 1956 | Kathryn E. Granahan (D) | November 6, 1956 |
| 85th | NM at-large | Antonio M. Fernández (D) | Died | Joseph Montoya (D) | April 9, 1957 |
| 85th | NJ 2 | T. Millet Hand (R) | Died December 26, 1956 | Milton W. Glenn (R) | November 5, 1957 |
| 85th | PA 13 | Samuel K. McConnell Jr. (R) | Resigned September 1, 1957 | John A. Lafore Jr. (R) | November 5, 1957 |
| 85th | GA 7 | Henderson L. Lanham (D) | Died | Harlan Mitchell (D) | January 8, 1958 |
| 85th | PA 21 | Augustine Kelley (D) | Died November 20, 1957 | John H. Dent (D) | January 21, 1958 |
| 85th | PA 4 | Earl Chudoff (D) | Resigned January 5, 1958 | Robert Nix (D) | May 20, 1958 |
| 86th | MO 4 | George H. Christopher (D) | Died January 23, 1959 | William J. Randall (D) | March 3, 1959 |
| 86th | NY 43 | Daniel A. Reed (R) | Died February 19, 1959 | Charles Goodell (R) | May 26, 1959 |
| 86th | IA 4 | Steven V. Carter (D) | Died November 4, 1959 | John Henry Kyl (R) | December 15, 1959 |
| 86th | NY 23 | Isidore Dollinger (D) | Resigned December 31, 1959 | Jacob H. Gilbert (D) | March 8, 1960 |
| 86th | PA 17 | Alvin Bush (R) | Died November 5, 1959 | Herman T. Schneebeli (R) | April 26, 1960 |
| 86th | NC 12 | David McKee Hall (D) | Died January 29, 1960 | Roy A. Taylor (D) | June 25, 1960 |
| 86th | PA 18 | Richard M. Simpson (R) | Died January 7, 1960 | Douglas Elliott (R) | April 26, 1960 |
| 86th | OH 6 | James G. Polk (D) | Died April 28, 1959 | Ward Miller (R) | November 8, 1960 |
| 86th | PA 18 | Douglas Elliott (R) | Died June 19, 1960 | J. Irving Whalley (R) | November 8, 1960 |
| 86th | WA 3 | Russell V. Mack (R) | Died March 28, 1960 | Julia Butler Hansen (D) | November 8, 1960 |
| 87th | AR 6 | William F. Norrell (D) | Died February 15, 1961 | Catherine Norrell (D) | April 19, 1961 |
| 87th | AZ 2 | Stewart Udall (D) | Resigned January 18, 1961 | Mo Udall (D) | May 2, 1961 |
| 87th | PA 16 | Walter M. Mumma (R) | Died February 25, 1961 | John C. Kunkel (R) | May 16, 1961 |
| 87th | TN 1 | B. Carroll Reece (R) | Died March 19, 1961 | Louise Goff Reece (R) | May 16, 1961 |
| 87th | TX 20 | Paul J. Kilday (D) | Resigned September 24, 1961 | Henry B. González (D) | November 4, 1961 |
| 87th | MI 1 | Thaddeus M. Machrowicz (D) | Resigned September 18, 1961 | Lucien Nedzi (D) | November 7, 1961 |
| 87th | LA 4 | Overton Brooks (D) | Died September 16, 1961 | Joe Waggonner (D) | December 19, 1961 |
| 87th | TX 13 | Frank N. Ikard (D) | Resigned December 15, 1961 | Graham B. Purcell Jr. (D) | January 27, 1962 |
| 87th | TX 4 | Sam Rayburn (D) | Died November 16, 1961 | Ray Roberts (D) | January 30, 1962 |
| 87th | MI 14 | Louis C. Rabaut (D) | Died November 12, 1961 | Harold M. Ryan (D) | February 13, 1962 |
| 87th | NY 6 | Lester Holtzman (D) | Resigned December 31, 1961 | Benjamin Rosenthal (D) | February 20, 1962 |
| 87th | SC 2 | John J. Riley (D) | Died January 1, 1962 | Corinne Riley (D) | April 10, 1962 |
| 88th | CA 1 | Clement Miller (D) | Died October 7, 1962 | Don Clausen (R) | January 22, 1963 |
| 88th | CA 23 | Clyde Doyle (D) | Died March 14, 1963 | Del Clawson (R) | June 11, 1963 |
| 88th | PA 15 | Francis E. Walter (D) | Died May 31, 1963 | Fred B. Rooney (D) | July 30, 1963 |
| 88th | ND 1 | Hjalmar Carl Nygaard (R) | Died July 18, 1963 | Mark Andrews (R) | October 22, 1963 |
| 88th | PA 23 | Leon H. Gavin (R) | Died September 15, 1963 | Albert W. Johnson (R) | November 5, 1963 |
| 88th | TX 10 | Homer Thornberry (D) | Resigned December 20, 1963 | J. J. Pickle (D) | December 21, 1963 |
| 88th | CA 5 | Jack Shelley (D) | Resigned January 7, 1964 | Phillip Burton (D) | February 18, 1964 |
| 88th | TN 2 | Howard Baker Sr. (R) | Died January 7, 1964 | Irene Baker (R) | March 10, 1964 |
| 88th | PA 5 | William J. Green Jr. (D) | Died December 21, 1963 | William J. Green III (D) | April 28, 1964 |
| 88th | SC 5 | Robert W. Hemphill (D) | Resigned May 1, 1964 | Thomas S. Gettys (D) | November 3, 1964 |
| 88th | MO 9 | Clarence Cannon (D) | Died May 12, 1964 | William L. Hungate (D) | November 3, 1964 |
| 88th | OR 1 | Walter Norblad (R) | Died September 20, 1964 | Wendell Wyatt (R) | November 3, 1964 |
| 89th | SC 2 | Albert Watson (D) | Resigned | Albert Watson (R) | June 15, 1965 |
| 89th | LA 7 | Ashton Thompson (D) | Died | Edwin Edwards (D) | October 2, 1965[8] |
| 89th | OH 7 | Clarence J. Brown (R) | Died August 23, 1965 | Bud Brown (R) | November 2, 1965 |
| 89th | CA 26 | James Roosevelt (D) | Resigned | Tom Rees (D) | December 15, 1965 |
| 89th | NC 1 | Herbert C. Bonner (D) | Died November 7, 1965 | Walter B. Jones Sr. (D) | February 5, 1966 |
| 89th | NY 17 | John Lindsay (D) | Resigned | Theodore R. Kupferman (R) | February 8, 1966 |
| 89th | TX 8 | Albert Thomas (D) | Died | Lera Thomas (D) | March 26, 1966 |
| 89th | CA 14 | John Baldwin (R) | Died | Jerry Waldie (D) | June 7, 1966 |
| 89th | AR 4 | Oren Harris (D) | Resigned | David Pryor (D) | November 8, 1966 |
| 89th | MI 9 | Robert P. Griffin (R) | Resigned | Guy Vander Jagt (R) | November 8, 1966 |
| 90th | RI 2 | John Fogarty (D) | Died | Robert Tiernan (D) | March 28, 1967 |
| 90th | CA 11 | Arthur Younger (R) | Died | Pete McCloskey (R) | December 12, 1967 |
| 90th | NY 13 | Abraham Multer (D) | Resigned | Bert Podell (D) | February 20, 1968 |
| 90th | MS 3 | John Williams (D) | Resigned | Charles Griffin (D) | March 12, 1968 |
| 90th | TX 3 | Joe Pool (D) | Died | Jim Collins (R) | August 24, 1968 |
| 90th | PA 20 | Elmer Holland (D) | Died August 9, 1968 | Joe Gaydos (D) | November 5, 1968 |
| 91st | TN 8 | Fats Everett (D) | Died | Ed Jones (D) | March 25, 1969 |
| 91st | WI 7 | Melvin Laird (R) | Resigned | Dave Obey (D) | April 1, 1969 |
| 91st | CA 27 | Ed Reinecke (R) | Resigned | Barry Goldwater Jr. (R) | April 29, 1969 |
| 91st | MT 2 | James F. Battin (R) | Resigned | John Melcher (D) | June 24, 1969 |
| 91st | MA 6 | Bill Bates (R) | Died | Mike Harrington (D) | September 30, 1969 |
| 91st | NJ 8 | Charles Joelson (D) | Resigned | Bob Roe (D) | November 4, 1969 |
| 91st | IL 13 | Donald Rumsfeld (R) | Resigned | Phil Crane (R) | November 25, 1969 |
| 91st | CA 35 | Jim Utt (R) | Died | John Schmitz (R) | June 30, 1970 |
| 91st | CA 24 | Glen Lipscomb (R) | Died | John Rousselot (R) | June 30, 1970 |
| 91st | CT 2 | Bill St. Onge (D) | Died | Robert Steele (R) | November 3, 1970 |
| 91st | NJ 6 | Bill Cahill (R) | Resigned | Edwin Forsythe (R) | November 3, 1970 |
| 91st | OH 19 | Mike Kirwan (D) | Died | Charles Carney (D) | November 3, 1970 |
| 91st | PA 9 | Robert Watkins (R) | Died August 7, 1970 | John Ware (R) | November 3, 1970 |
| 91st | IL 6 | Dan Ronan (D) | Died | George Collins (D) | December 3, 1970 |
| 92nd | SC 1 | Mendel Rivers (D) | Died | Mendel Davis (D) | April 27, 1971 |
| 92nd | MD 1 | Rogers Morton (R) | Resigned | Bill Mills (R) | May 25, 1971 |
| 92nd | PA 18 | Robert J. Corbett (R) | Died April 25, 1971 | John Heinz (R) | November 2, 1971 |
| 92nd | KY 6 | John C. Watts (D) | Died | William P. Curlin Jr. (D) | December 4, 1971 |
| 92nd | VT at-large | Robert Stafford (R) | Resigned | Richard W. Mallary (R) | January 7, 1972 |
| 92nd | AL 3 | George Andrews (D) | Died December 25, 1971 | Elizabeth Andrews (D) | April 4, 1972 |
| 92nd | IL 15 | Charlotte Reid (R) | Resigned | Cliffard Carlson (R) | April 4, 1972 |
| 92nd | PA 27 | James G. Fulton (R) | Died October 6, 1971 | William Sheldrick Conover (R) | April 25, 1972 |
| 92nd | LA 7 | Edwin Edwards (D) | Resigned | John Breaux (D) | September 30, 1972 |
| 92nd | VA 6 | Richard H. Poff (R) | Resigned | Caldwell Butler (R) | November 7, 1972 |
| 93rd | AK at-large | Nick Begich (D) | Died | Don Young (R) | March 6, 1973 |
| 93rd | LA 2 | Hale Boggs (D) | Died | Lindy Boggs (D) | March 20, 1973 |
| 93rd | IL 7 | George Collins (D) | Died | Cardiss Collins (D) | June 5, 1973 |
| 93rd | MD 1 | Bill Mills (R) | Died | Bob Bauman (R) | August 21, 1973 |
| 93rd | PA 12 | John Saylor (R) | Died October 28, 1973 | John Murtha (D) | February 25, 1974 |
| 93rd | MI 5 | Gerald Ford (R) | Resigned | Richard VanderVeen (D) | February 18, 1974 |
| 93rd | OH 1 | Bill Keating (R) | Resigned | Tom Luken (D) | March 5, 1974 |
| 93rd | MI 8 | R. James Harvey (R) | Resigned | J. Bob Traxler (D) | April 16, 1974 |
| 93rd | CA 6 | William S. Mailliard (R) | Resigned | John Burton (D) | June 4, 1974 |
| 93rd | CA 13 | Charles M. Teague (R) | Died | Robert Lagomarsino (R) | June 4, 1974 |
| 94th | LA 6 | None | Results of the preceding election were annulled because of claimed tabulation irregularities | W. Henson Moore (R) | January 7, 1975 |
| 94th | CA 37 | Jerry Pettis (R) | Died | Shirley Pettis (R) | April 29, 1975 |
| 94th | IL 5 | John Kluczynski (D) | Died | John Fary (D) | July 8, 1975 |
| 94th | TN 5 | Richard Fulton (D) | Resigned | Clifford Allen (D) | November 25, 1975 |
| 94th | NY 39 | James F. Hastings (R) | Resigned | Stan Lundine (D) | March 2, 1976 |
| 94th | TX 22 | Robert R. Casey (D) | Resigned | Ron Paul (R) | April 3, 1976 |
| 94th | TX 1 | Wright Patman (D) | Died | Sam B. Hall Jr. (D) | June 19, 1976 |
| 94th | MA 7 | Torbert MacDonald (D) | Died | Ed Markey (D) | November 2, 1976 |
| 94th | MO 6 | Jerry Litton (D) | Died | Tom Coleman (R) | November 2, 1976 |
| 94th | PA 1 | William A. Barrett (D) | Died April 12, 1976 | Michael Myers (D) | November 2, 1976 |
| 95th | MN 7 | Bob Bergland (D) | Resigned | Arlan Stangeland (R) | February 22, 1977 |
| 95th | GA 5 | Andrew Young (D) | Resigned | Wyche Fowler (D) | April 6, 1977 |
| 95th | WA 7 | Brock Adams (D) | Resigned | John E. Cunningham (R) | May 17, 1977 |
| 95th | LA 1 | Rick Tonry (D) | Resigned | Bob Livingston (R) | August 27, 1977 |
| 95th | NY 18 | Ed Koch (D) | Resigned | Bill Green (R) | February 14, 1978 |
| 95th | NY 21 | Herman Badillo (D) | Resigned | Robert Garcia (D) | February 14, 1978 |
| 96th | CA 11 | Leo Ryan (D) | Died | William Royer (R) | April 3, 1979 |
| 96th | WI 6 | William A. Steiger (R) | Died | Tom Petri (R) | April 3, 1979 |
| 96th | IL 10 | Abner Mikva (D) | Resigned | John Porter (R) | January 22, 1980 |
| 96th | WV 3 | John M. Slack Jr. (D) | Died | John G. Hutchinson (D) | April 9, 1980 |
| 96th | PA 11 | Dan Flood (D) | Resigned | Raphael Musto (D) | April 9, 1980 |
| 96th | LA 3 | Dave Treen (R) | Resigned | Billy Tauzin (D) | May 17, 1980 |
| 96th | MI 13 | Charles Diggs (D) | Resigned | George Crockett Jr. (D) | November 4, 1980 |
| 97th | MI 4 | David Stockman (R) | Resigned | Mark D. Siljander (R) | April 21, 1981 |
| 97th | MD 5 | Gladys Spellman (D) | Fell into a permanent coma, resulting in the seat being declared vacant | Steny Hoyer (D) | May 19, 1981 |
| 97th | OH 4 | Tennyson Guyer (R) | Died | Mike Oxley (R) | June 25, 1981 |
| 97th | MS 4 | Jon Hinson (R) | Resigned | Wayne Dowdy (D) | July 7, 1981 |
| 97th | PA 3 | Ray Lederer (D) | Resigned April 29, 1981 | Joseph F. Smith (D) | July 21, 1981 |
| 97th | CT 1 | William Cotter (D) | Died | Barbara B. Kennelly (D) | January 12, 1982 |
| 97th | OH 17 | John M. Ashbrook (R) | Died | Jean Spencer Ashbrook (R) | June 29, 1982 |
| 97th | CA 30 | George E. Danielson (D) | Resigned | Matthew G. Martinez (D) | July 13, 1982 |
| 97th | IN 1 | Adam Benjamin Jr. (D) | Died | Katie Hall (D) | November 2, 1982 |
| 98th | TX 6 | Phil Gramm (D) | Resigned | Phil Gramm (R) | February 12, 1983 |
| 98th | NY 7 | Benjamin Rosenthal (D) | Died | Gary Ackerman (D) | March 1, 1983 |
| 98th | CO 6 | None[w] | Representative-elect Jack Swigert (R) died December 27, 1982 | Dan Schaefer (R) | March 29, 1983 |
| 98th | CA 5 | Phillip Burton (D) | Died | Sala Burton (D) | June 21, 1983 |
| 98th | IL 1 | Harold Washington (D) | Resigned | Charles Hayes (D) | August 23, 1983 |
| 98th | GA 7 | Larry McDonald (D) | Died September 1, 1983 | Buddy Darden (D) | November 8, 1983 |
| 98th | WI 4 | Clement Zablocki (D) | Died | Jerry Kleczka (D) | April 3, 1984 |
| 98th | KY 7 | Carl Perkins (D) | Died | Chris Perkins (D) | November 6, 1984 |
| 98th | NJ 13 | Edwin Forsythe (R) | Died March 29, 1984 | Jim Saxton (R) | November 6, 1984 |
| 99th | LA 8 | Gillis Long (D) | Died | Catherine Small Long (D) | March 30, 1985 |
| 99th | TX 1 | Sam Hall (D) | Resigned | Jim Chapman (D) | September 4, 1985 |
| 99th | NY 6 | Joe Addabbo (D) | Died | Alton Waldon (D) | July 10, 1986 |
| 99th | HI 1 | Cec Heftel (D) | Resigned | Neil Abercrombie (D) | September 20, 1986 |
| 99th | NC 10 | Jim Broyhill (R) | Resigned | Cass Ballenger (R) | November 4, 1986 |
| 100th | CA 5 | Sala Burton (D) | Died | Nancy Pelosi (D) | June 2, 1987 |
| 100th | CT 4 | Stewart McKinney (R) | Died | Chris Shays (R) | August 18, 1987 |
| 100th | TN 5 | Bill Boner (D) | Resigned | Bob Clement (D) | January 19, 1988 |
| 100th | LA 4 | Buddy Roemer (D) | Resigned | Jim McCrery (R) | April 16, 1988 |
| 100th | VA 5 | Dan Daniel (D) | Died | Lewis Payne (D) | June 14, 1988 |
| 100th | IL 21 | Melvin Price (D) | Died | Jerry Costello (D) | August 9, 1988 |
| 100th | NJ 3 | James Howard (D) | Died March 25, 1988 | Frank Pallone (D) | November 8, 1988 |
| 100th | TN 2 | John Duncan (R) | Died | Jimmy Duncan (R) | November 8, 1988 |
| 101st | IN 4 | Dan Coats (R) | Resigned | Jill Long (D) | March 28, 1989 |
| 101st | AL 3 | Bill Nichols (D) | Died | Glen Browder (D) | April 4, 1989 |
| 101st | WY at-large | Dick Cheney (R) | Resigned | Craig Thomas (R) | April 26, 1989 |
| 101st | FL 18 | Claude Pepper (D) | Died | Ileana Ros-Lehtinen (R) | August 29, 1989 |
| 101st | CA 15 | Tony Coelho (D) | Resigned | Gary Condit (D) | September 12, 1989 |
| 101st | TX 12 | Jim Wright (D) | Resigned | Pete Geren (D) | September 12, 1989 |
| 101st | MS 5 | Larkin Smith (R) | Died | Gene Taylor (D) | October 17, 1989 |
| 101st | TX 18 | Mickey Leland (D) | Died | Craig Washington (D) | December 9, 1989 |
| 101st | NY 14 | Guy Molinari (R) | Resigned | Susan Molinari (R) | March 20, 1990 |
| 101st | NY 18 | Robert Garcia (D) | Resigned | Jose Serrano (D) | March 20, 1990 |
| 101st | HI 2 | Daniel Akaka (D) | Resigned | Patsy Mink (D) | September 22, 1990 |
| 101st | NJ 1 | Jim Florio (D) | Resigned | Rob Andrews (D) | November 6, 1990 |
| 102nd | TX 3 | Steve Bartlett (R) | Resigned | Sam Johnson (R) | May 18, 1991 |
| 102nd | MA 1 | Silvio Conte (R) | Died | John Olver (D) | June 4, 1991 |
| 102nd | IL 15 | Ed Madigan (R) | Resigned | Tom Ewing (R) | July 2, 1991 |
| 102nd | AZ 2 | Mo Udall (D) | Resigned | Ed Pastor (D) | October 3, 1991 |
| 102nd | PA 2 | Bill Gray (D) | Resigned | Lucien Blackwell (D) | November 5, 1991 |
| 102nd | VA 7 | D. French Slaughter (R) | Resigned | George Allen (R) | November 5, 1991 |
| 102nd | NY 17 | Ted Weiss (D) | Died | Jerrold Nadler (D) | November 3, 1992 |
| 102nd | NC 1 | Walter Jones Sr. (D) | Died | Eva Clayton (D) | November 3, 1992 |
| 103rd | MS 2 | Mike Espy (D) | Resigned | Bennie Thompson (D) | April 13, 1993 |
| 103rd | WI 1 | Les Aspin (D) | Resigned | Peter Barca (D) | May 4, 1993 |
| 103rd | OH 2 | Bill Gradison (R) | Resigned | Rob Portman (R) | May 4, 1993 |
| 103rd | CA 17 | Leon Panetta (D) | Resigned | Sam Farr (D) | June 8, 1993 |
| 103rd | MI 3 | Paul Henry (R) | Died | Vern Ehlers (R) | December 7, 1993 |
| 103rd | OK 6 | Glenn English (D) | Resigned | Frank Lucas (R) | May 10, 1994 |
| 103rd | KY 2 | William Natcher (D) | Died | Ron Lewis (R) | May 24, 1994 |
| 103rd | OK 1 | Jim Inhofe (R) | Resigned | Steve Largent (R) | November 8, 1994 |
| 104th | CA 15 | Norman Mineta (D) | Resigned | Tom Campbell (R) | December 12, 1995 |
| 104th | IL 2 | Mel Reynolds (D) | Resigned | Jesse Jackson Jr. (D) | December 12, 1995 |
| 104th | CA 37 | Walter R. Tucker III (D) | Resigned | Juanita Millender-McDonald (D) | March 26, 1996 |
| 104th | MD 7 | Kweisi Mfume (D) | Resigned | Elijah Cummings (D) | April 16, 1996 |
| 104th | OR 3 | Ron Wyden (D) | Resigned | Earl Blumenauer (D) | May 21, 1996 |
| 104th | KS 2 | Sam Brownback (R) | Resigned | Jim Ryun (R) | November 5, 1996 |
| 104th | MO 8 | Bill Emerson (R) | Died | Jo Ann Emerson (R) | November 5, 1996 |
| 105th | TX 28 | Frank Tejeda (D) | Died | Ciro Rodriguez (D) | April 12, 1997 |
| 105th | NM 3 | Bill Richardson (D) | Resigned | Bill Redmond (R) | May 13, 1997 |
| 105th | NY 13 | Susan Molinari (R) | Resigned | Vito Fossella (R) | November 4, 1997 |
| 105th | NY 6 | Floyd Flake (D) | Resigned | Gregory Meeks (D) | February 3, 1998 |
| 105th | CA 22 | Walter Capps (D) | Died | Lois Capps (D) | March 10, 1998 |
| 105th | CA 9 | Ron Dellums (D) | Resigned | Barbara Lee (D) | April 7, 1998 |
| 105th | CA 44 | Sonny Bono (R) | Died | Mary Bono (R) | April 7, 1998 |
| 105th | PA 1 | Tom Foglietta (D) | Resigned | Bob Brady (D) | May 19, 1998 |
| 105th | NM 1 | Steven Schiff (R) | Died | Heather Wilson (R) | June 23, 1998 |
| 106th | GA 6 | Newt Gingrich (R) | Resigned | Johnny Isakson (R) | February 23, 1999 |
| 106th | LA 1 | Bob Livingston (R) | Resigned | David Vitter (R) | May 29, 1999 |
| 106th | CA 42 | George Brown Jr. (D) | Died | Joe Baca (D) | November 16, 1999 |
| 107th | PA 9 | Bud Shuster (R) | Resigned | Bill Shuster (R) | May 15, 2001 |
| 107th | CA 32 | Julian Dixon (D) | Died | Diane Watson (D) | June 5, 2001 |
| 107th | VA 4 | Norman Sisisky (D) | Died | Randy Forbes (R) | June 19, 2001 |
| 107th | MA 9 | Joe Moakley (D) | Died | Stephen Lynch (D) | October 16, 2001 |
| 107th | FL 1 | Joe Scarborough (R) | Resigned | Jeff Miller (R) | October 16, 2001 |
| 107th | AR 3 | Asa Hutchinson (R) | Resigned | John Boozman (R) | November 20, 2001 |
| 107th | SC 2 | Floyd Spence (R) | Died | Joe Wilson (R) | December 18, 2001 |
| 107th | OK 1 | Steve Largent (R) | Resigned | John Sullivan (R) | January 8, 2002 |
| 107th | HI 2 | Patsy Mink (D) | Died | Ed Case (D) | November 30, 2002 |
| 108th | Ed Case (D) | January 4, 2003 |
| 108th | TX 19 | Larry Combest (R) | Resigned | Randy Neugebauer (R) | June 3, 2003 |
| 108th | KY 6 | Ernie Fletcher (R) | Resigned | Ben Chandler (D) | February 17, 2004 |
| 108th | SD at-large | Bill Janklow (R) | Resigned | Stephanie Herseth Sandlin (D) | June 1, 2004 |
| 108th | NC 1 | Frank Ballance (D) | Resigned | G. K. Butterfield (D) | July 20, 2004 |
| 109th | CA 5 | Bob Matsui (D) | Died | Doris Matsui (D) | March 8, 2005 |
| 109th | OH 2 | Rob Portman (R) | Resigned | Jean Schmidt (R) | August 2, 2005 |
| 109th | CA 48 | Christopher Cox (R) | Resigned | John Campbell (R) | December 6, 2005 |
| 109th | CA 50 | Duke Cunningham (R) | Resigned | Brian Bilbray (R) | June 6, 2006 |
| 109th | NJ 13 | Bob Menendez (D) | Resigned | Albio Sires (D) | November 7, 2006 |
| 109th | TX 22 | Tom DeLay (R) | Resigned | Shelley Sekula-Gibbs (R) | November 7, 2006 |
| 110th | GA 10 | Charlie Norwood (R) | Died | Paul Broun (R) | July 19, 2007 |
| 110th | CA 37 | Juanita Millender-McDonald (D) | Died | Laura Richardson (D) | August 21, 2007 |
| 110th | MA 5 | Marty Meehan (D) | Resigned | Niki Tsongas (D) | October 16, 2007 |
| 110th | OH 5 | Paul Gillmor (R) | Died | Bob Latta (R) | December 11, 2007 |
| 110th | VA 1 | Jo Ann Davis (R) | Died | Rob Wittman (R) | December 11, 2007 |
| 110th | IL 14 | Dennis Hastert (R) | Resigned | Bill Foster (D) | March 8, 2008 |
| 110th | IN 7 | Julia Carson (D) | Died | André Carson (D) | March 11, 2008 |
| 110th | CA 12 | Tom Lantos (D) | Died | Jackie Speier (D) | April 8, 2008 |
| 110th | LA 1 | Bobby Jindal (R) | Resigned | Steve Scalise (R) | May 3, 2008 |
| 110th | LA 6 | Richard Baker (R) | Resigned | Don Cazayoux (D) | May 3, 2008 |
| 110th | MS 1 | Roger Wicker (R) | Resigned | Travis Childers (D) | May 13, 2008 |
| 110th | MD 4 | Albert Wynn (D) | Resigned | Donna Edwards (D) | June 17, 2008 |
| 110th | OH 11 | Stephanie Tubbs Jones (D) | Died | Marcia Fudge (D) | November 18, 2008 |
| 111th | NY 20 | Kirsten Gillibrand (D) | Resigned | Scott Murphy (D) | March 31, 2009 |
| 111th.[x] | IL 5 | Rahm Emanuel (D) | Resigned | Mike Quigley (D) | April 7, 2009 |
| 111th | CA 32 | Hilda Solis (D) | Resigned | Judy Chu (D) | July 14, 2009 |
| 111th | CA 10 | Ellen Tauscher (D) | Resigned | John Garamendi (D) | November 3, 2009 |
| 111th | NY 23 | John M. McHugh (R) | Resigned | Bill Owens (D) | November 3, 2009 |
| 111th | FL 19 | Robert Wexler (D) | Resigned | Ted Deutch (D) | April 13, 2010 |
| 111th | PA 12 | John Murtha (D) | Died February 8, 2010 | Mark Critz (D) | May 18, 2010 |
| 111th | HI 1 | Neil Abercrombie (D) | Resigned | Charles Djou (R) | May 22, 2010 |
| 111th | GA 9 | Nathan Deal (R) | Resigned | Tom Graves (R) | June 8, 2010[y] |
| 111th | IN 3 | Mark Souder (R) | Resigned | Marlin Stutzman (R) | November 2, 2010 |
| 111th | NY 29 | Eric Massa (D) | Resigned | Tom Reed (R) | November 2, 2010 |
| 112th | NY 26 | Chris Lee (R) | Resigned | Kathy Hochul (D) | May 24, 2011 |
| 112th | CA 36 | Jane Harman (D) | Resigned | Janice Hahn (D) | July 12, 2011 |
| 112th | NV 2 | Dean Heller (R) | Resigned | Mark Amodei (R) | September 13, 2011 |
| 112th | NY 9 | Anthony Weiner (D) | Resigned | Bob Turner (R) | September 13, 2011 |
| 112th | OR 1 | David Wu (D) | Resigned | Suzanne Bonamici (D) | January 31, 2012 |
| 112th | AZ 8 | Gabby Giffords (D) | Resigned | Ron Barber (D) | June 12, 2012 |
| 112th | KY 4 | Geoff Davis (R) | Resigned | Thomas Massie (R) | November 6, 2012 |
| 112th | MI 11 | Thad McCotter (R) | Resigned | David Curson (D) | November 6, 2012 |
| 112th | NJ 10 | Donald M. Payne (D) | Died | Donald Payne Jr. (D) | November 6, 2012 |
| 112th | WA 1 | Jay Inslee (D) | Resigned | Suzan DelBene (D) | November 6, 2012 |
| 113th | IL 2 | Jesse Jackson Jr. (D) | Resigned[9] | Robin Kelly (D) | April 9, 2013 |
| 113th | SC 1 | Tim Scott (R) | Resigned | Mark Sanford (R) | May 7, 2013 |
| 113th | MO 8 | Jo Ann Emerson (R) | Resigned | Jason Smith (R) | June 4, 2013 |
| 113th | LA 5 | Rodney Alexander (R) | Resigned | Vance McAllister (R) | November 16, 2013 |
| 113th | MA 5 | Ed Markey (D) | Resigned | Katherine Clark (D) | December 10, 2013 |
| 113th | AL 1 | Jo Bonner (R) | Resigned | Bradley Byrne (R) | December 17, 2013 |
| 113th | FL 13 | Bill Young (R) | Died October 18, 2013 | David Jolly (R) | March 11, 2014 |
| 113th | FL 19 | Trey Radel (R) | Resigned January 27, 2014 | Curt Clawson (R) | June 24, 2014 |
| 113th | NC 12 | Mel Watt (D) | Resigned January 6, 2014 | Alma Adams (D) | November 4, 2014 |
| 113th | NJ 1 | Rob Andrews (D) | Resigned February 18, 2014 | Donald Norcross (D) | November 4, 2014 |
| 113th | VA 7 | Eric Cantor (R) | Resigned August 1, 2014 | Dave Brat (R) | November 4, 2014 |
| 114th | NY 11 | Michael Grimm (R) | Resigned January 5, 2015 | Dan Donovan (R) | May 5, 2015 |
| 114th | MS 1 | Alan Nunnelee (R) | Died February 6, 2015 | Trent Kelly (R) | May 12, 2015 |
| 114th | IL 18 | Aaron Schock (R) | Resigned March 31, 2015 | Darin LaHood (R) | September 10, 2015 |
| 114th | OH 8 | John Boehner (R) | Resigned October 29, 2015 | Warren Davidson (R) | June 7, 2016 |
| 114th | PA 2 | Chaka Fattah (D) | Resigned June 23, 2016 | Dwight Evans (D) | November 8, 2016 |
| 114th | HI 1 | Mark Takai (D) | Died July 20, 2016 | Colleen Hanabusa (D) | November 8, 2016 |
| 114th | KY 1 | Ed Whitfield (R) | Resigned September 6, 2016 | James Comer (R) | November 8, 2016 |
| 115th | KS 4 | Mike Pompeo (R) | Resigned January 23, 2017 | Ron Estes (R) | April 11, 2017 |
| 115th | MT at-large | Ryan Zinke (R) | Resigned March 1, 2017 | Greg Gianforte (R) | May 25, 2017 |
| 115th | CA 34 | Xavier Becerra (D) | Resigned January 24, 2017 | Jimmy Gomez (D) | June 6, 2017 |
| 115th | GA 6 | Tom Price (R) | Resigned February 10, 2017 | Karen Handel (R) | June 20, 2017 |
| 115th | SC 5 | Mick Mulvaney (R) | Resigned February 16, 2017 | Ralph Norman (R) | June 20, 2017 |
| 115th | UT 3 | Jason Chaffetz (R) | Resigned June 30, 2017 | John Curtis (R) | November 7, 2017 |
| 115th | PA 18 | Tim Murphy (R) | Resigned October 21, 2017[10] | Conor Lamb (D) | March 13, 2018 |
| 115th | AZ 8 | Trent Franks (R) | Resigned December 8, 2017 | Debbie Lesko (R) | April 24, 2018 |
| 115th | TX 27 | Blake Farenthold (R) | Resigned April 6, 2018 | Michael Cloud (R) | June 30, 2018 |
| 115th | OH 12 | Pat Tiberi (R) | Resigned January 15, 2018 | Troy Balderson (R) | August 7, 2018 |
| 115th | MI 13 | John Conyers (D) | Resigned December 5, 2017 | Brenda Jones (D) | November 6, 2018 |
| 115th | NY 25 | Louise Slaughter (D) | Died March 16, 2018 | Joseph Morelle (D) | November 6, 2018 |
| 115th | PA 7 | Pat Meehan (R) | Resigned April 27, 2018 | Mary Gay Scanlon (D) | November 6, 2018 |
| 115th | PA 15 | Charlie Dent (R) | Resigned May 12, 2018 | Susan Wild (D) | November 6, 2018 |
| 116th | PA 12 | Tom Marino (R) | Resigned January 23, 2019 | Fred Keller (R) | May 21, 2019 |
| 116th | NC 3 | Walter B. Jones Jr. (R) | Died February 10, 2019 | Greg Murphy (R) | September 10, 2019 |
| 116th | NC 9 | None | Results of 2018 election were annulled; seat was declared vacant[11][12] | Dan Bishop (R) | September 10, 2019 |
| 116th | MD 7 | Elijah Cummings (D) | Died October 17, 2019 | Kweisi Mfume (D) | April 28, 2020 |
| 116th | CA 25 | Katie Hill (D) | Resigned November 3, 2019 | Mike Garcia (R) | May 12, 2020 |
| 116th | WI 7 | Sean Duffy (R) | Resigned September 23, 2019 | Tom Tiffany (R) | May 12, 2020 |
| 116th | NY 27 | Chris Collins (R) | Resigned October 1, 2019 | Chris Jacobs (R) | June 23, 2020 |
| 116th | GA 5 | John Lewis (D) | Died July 17, 2020 | Kwanza Hall (D) | December 1, 2020 |
| 117th | LA 5 | None | Representative-elect Luke Letlow (R) died December 29, 2020 | Julia Letlow (R) | March 20, 2021 |
| 117th | LA 2 | Cedric Richmond (D) | Resigned January 15, 2021 | Troy Carter (D) | April 24, 2021 |
| 117th | NM 1 | Deb Haaland (D) | Resigned March 16, 2021 | Melanie Stansbury (D) | June 1, 2021 |
| 117th | TX 6 | Ron Wright (R) | Died February 7, 2021 | Jake Ellzey (R) | July 27, 2021 |
| 117th | OH 11 | Marcia Fudge (D) | Resigned March 10, 2021 | Shontel Brown (D) | November 2, 2021 |
| 117th | OH 15 | Steve Stivers (R) | Resigned May 16, 2021 | Mike Carey (R) | November 2, 2021 |
| 117th | FL 20 | Alcee Hastings (D) | Died April 6, 2021 | Sheila Cherfilus-McCormick (D) | January 11, 2022 |
| 117th | CA 22 | Devin Nunes (R) | Resigned January 1, 2022 | Connie Conway (R) | June 7, 2022 |
| 117th | TX 34 | Filemon Vela Jr. (D) | Resigned March 31, 2022 | Mayra Flores (R) | June 14, 2022 |
| 117th | NE 1 | Jeff Fortenberry (R) | Resigned March 31, 2022 | Mike Flood (R) | June 28, 2022 |
| 117th | MN 1 | Jim Hagedorn (R) | Died February 17, 2022 | Brad Finstad (R) | August 9, 2022 |
| 117th | AK at-large | Don Young (R) | Died March 18, 2022 | Mary Peltola (D) | August 16, 2022 |
| 117th | NY 19 | Antonio Delgado (D) | Resigned May 25, 2022 | Pat Ryan (D) | August 23, 2022 |
| 117th | NY 23 | Tom Reed (R) | Resigned May 10, 2022 | Joe Sempolinski (R) | August 23, 2022 |
| 117th | IN 2 | Jackie Walorski (R) | Died August 3, 2022 | Rudy Yakym (R) | November 8, 2022 |
| 118th | VA 4 | None | Donald McEachin (D) died November 28, 2022, during the previous Congress | Jennifer McClellan (D) | February 21, 2023 |
| 118th | RI 1 | David Cicilline (D) | Resigned May 31, 2023 | Gabe Amo (D) | November 7, 2023 |
| 118th | UT 2 | Chris Stewart (R) | Resigned September 15, 2023 | Celeste Maloy (R) | November 21, 2023 |
| 118th | NY 3 | George Santos (R) | Expelled on December 1, 2023 | Tom Suozzi (D) | February 13, 2024 |
| 118th | NY 26 | Brian Higgins (D) | Resigned February 2, 2024 | Tim Kennedy (D) | April 30, 2024 |
| 118th | CA 20 | Kevin McCarthy (R) | Resigned December 31, 2023 | Vince Fong (R) | May 21, 2024 |
| 118th | OH 6 | Bill Johnson (R) | Resigned January 21, 2024 | Michael Rulli (R) | June 11, 2024 |
| 118th | CO 4 | Ken Buck (R) | Resigned March 22, 2024 | | June 25, 2024 |
| 118th | NJ 10 | Donald Payne Jr. (D) | Died April 24, 2024 | | September 18, 2024 |
| 118th | WI 8 | Mike Gallagher (R) | Resigned April 24, 2024 | | November 5, 2024 |
