Thirty-one Gaelic football county teams from the island of Ireland, plus London, participated.
The top division was completed by newly promoted Kildare and Tyrone and 2011 All-Ireland Champions Dublin.
All-Ireland Champions Donegal travelled to Croke Park to play Kildare in their first league game of the season on 3 February 2013.
[2] On 28 April, Dublin defeated Tyrone by 0-18 to 0-17 to win their first league title since 1993.
Two late points by Dean Rock and one by Jack McCaffrey in the final four minutes steered Dublin to victory[3] The 2013 format of the National Football League was a system of four divisions of eight teams.