Edmunds County, South Dakota

The terrain of Edmunds County consists of rolling hills, mostly dedicated to agriculture. The terrain's highest point is on the west portion of the north boundary line, at 1,978 ft (603 m) ASL.^[5] The county has a total area of 1,151 square miles (2,980 km²), of which 1,126 square miles (2,920 km²) is land and 25 square miles (65 km²) (2.2%) is water.^[6]

As of the 2020 census, there were 3,986 people, 1,546 households, and 1,052 families residing in the county.^[17] The population density was 3.5 inhabitants per square mile (1.4/km²). There were 1,940 housing units.

As of the 2010 census, there were 4,071 people, 1,607 households and 1,057 families residing in the county. The population density was 3.6 per square mile (1.4/km²). There were 1,966 housing units at an average density of 1.7 per square mile (0.66/km²). The racial make-up of the county was 97.8% white, 0.4% American Indian, 0.1% black or African American, 0.1% Asian, 0.5% from other races, and 1.0% from two or more races. Those of Hispanic or Latino origin made up 1.4% of the population. In terms of ancestry, 70.8% were German, 11.4% were Norwegian, 10.1% were Russian, 5.9% were English and 2.4% were American.

Of the 1,607 households, 26.4% had children under the age of 18 living with them, 58.9% were married couples living together, 4.0% had a female householder with no husband present, 34.2% were non-families, and 31.0% of all households were made up of individuals. The average household size was 2.27 and the average family size was 2.84. The median age was 45.7 years.

The median household income was $47,026 and the median family income was $56,599. Males had a median income of $37,713 and females $26,287. The per capita income was $24,268. About 6.9% of families and 11.6% of the population were below the poverty line, including 11.0% of those under age 18 and 13.6% of those age 65 or over.

Edmunds County is where the Learjet of the PGA golfer Payne Stewart crashed, killing him and five others on board. The plane crashed just south of the community of Mina at the approximate coordinates of 45°25' N 98°45' W.

• Deerfield Colony
• Mina
• Pembrook Colony
• Plainview Colony

Edmunds County voters have long been reliably Republican. Since 1936, in only three elections has the county selected the Democratic Party candidate. Although it was one of only 129 counties nationwide to back George McGovern in his landslide 1972 defeat, it has voted for fewer Democratic presidential nominees (six) than any other county McGovern carried, with Jimmy Carter in 1976 the last Democrat to carry the county and Hillary Clinton not passing twenty percent in 2016.

• National Register of Historic Places listings in Edmunds County, South Dakota