Division One: 22 teams. Split into four regional groups Division Two: 10 teams. Split into two regional sections Each team played every other team in its division (or group where the division is split) once, either home or away.
2 points were awarded for a win and 1 for a draw.
Knockout stage qualifiers edit Division One title: top team in each group qualified for the semi-final Division Two (Midland) title: top team in each group qualified for the final Division Two (Northern) title: group winners win the title ^ http://www.crokepark.ie/gaa-museum/gaa-archive/gaa-years/2000-2009-(6)/1984-(1) [permanent dead link ] ^ GAA Final Teams ^ "Kerry V kildare 1931 All-Ireland Gaelic football Final at croke Park Dublin" . www.1st-stop-county-kerry.com . Archived from the original on 4 March 2016. Retrieved 6 June 2022 .^ "Up Kerry! Up the IRA!" . 5 March 2013.^ "Dublin's success at Newbridge", Irish Independent, 24 March 1930, p. 10 ^ "Dublin's good win", Irish Independent, 7 April 1930, p. 10 ^ "Won by a point", Irish Independent, 7 April 1930, p. 10 ^ "Four scores in poor game", Irish Independent, 17 November 1930, p. 11 ^ "Kerry defeat Dublin in National Football League", The Kerryman, 13 December 1930, p. 12 ^ "Won by a point", Irish Independent, 24 March 1930, p. 10 ^ "Home County weak", Irish Independent, 24 March 1930, p. 10 ^ "In The South", Irish Independent, 7 April 1930, p. 10 ^ "National League", Irish Independent, 8 April 1930, p. 14 ^ "Football League", Cork Examiner, 10 November 1930, p. 10 ^ "Dungarvan tie decides honours", Irish Independent, 8 December 1930, p. 13 ^ "In The North", Irish Independent, 24 March 1930, p. 10 ^ "Armagh outplayed", Irish Independent, 24 March 1930, p. 10 ^ "Homesters win well", Irish Independent, 7 April 1930, p. 10 ^ "Level scoring", Irish Independent, 7 April 1930, p. 10 ^ "A win for Cavan", Cork Examiner, 6 October 1930, p. 12 ^ "National Football League", Meath Chronicle, 8 November 1930, p. 9 ^ "Do Louth need a rest?", Irish Independent, 17 November 1930, p. 11 ^ "Weak teams suffer the penalty", Irish Independent, 24 November 1930, p. 12 ^ "Weak teams suffer the penalty", Irish Independent, 24 November 1930, p. 12 ^ "Smith's first match", Irish Independent, 8 December 1930, p. 13 ^ "A lucky draw", Irish Independent, 8 December 1930, p. 13 ^ "Croke Park", Irish Independent, 5 December 1930, p,13 ^ "Antrim's narrow defeat at Navan", Irish Independent, 15 December 1930, p. 11 ^ "Cavan ready Divisional winners", Meath Chronicle, 24 January 1931, p. 9 ^ "Connacht Senior Football League", Connaught Telegraph, 3 May 1930, p. 4 ^ "Galway play and win", Irish Independent, 12 May 1930, p. 11 ^ "1930" .^ "Leitrim's success", Irish Independent, 22 July 1930, p. 13 ^ "Connacht League", Irish Independent, 22 September 1930, p. 10 ^ "GAA games", Irish Independent, 3 October 1930, p. 14 ^ "Galway's defeat of Sligo", Connacht Tribune, 11 October 1930, p. 11 ^ "Kerry's win", The Cork Examiner, 16 February 1931, p.12 ^ "Second Semi-final", The Cork Examiner, 16 February 1931, p.12 ^ "Depleted Kerry Team", The Kerryman, 7 March 1931, p.10 ^ "For The Record, A History of the National Football and Hurling League Finals", Tom Morrisson, Collins Press, 2002, ISBN 9781903464151 ^ "One-sided match", Irish Independent, 24 March 1930, p. 10 ^ "Decisions unpopular", Irish Independent, 7 April 1930, p. 10 ^ "National League", Meath Chronicle, 6 September 1930, p. 9 ^ "Midland - Group A", Irish Independent, 25 March 1930, p. 12 ^ "Wicklow very weak", Irish Independent, 7 April 1930, p. 10 ^ "Kilkenny and Carlow draw", Cork Examiner, 10 November 1930, p. 10 ^ "A poor contest", Irish Independent, 8 December 1930, p. 13 ^ "Donegal's first match in National League", Donegal News, 29 March 1930, p. 3 ^ "Narrow victory", Irish Independent, 24 March 1930, p. 10 ^ "Exciting match", Irish Independent, 7 April 1930, p. 10 ^ "Close struggle in Derry", Irish Independent, 7 April 1930, p. 10 ^ "National League Fixture", Donegal News, 6 September 1930, p. 3 ^ "Donegal defeat Fermanagh", Irish Independent, 6 October 1930, p. 12 ^ "National League success", Donegal News, 11 October 1930, p. 5