Thirty-one county teams from the island of Ireland, plus London, compete.
On 9 April 2017 Kerry won their 20th National League title, beating Dublin by 0-20 to 1-16 in the final.
Dublin were the reigning champions and were bidding for their fifth successive title.
[1][2][3] Eir Sport (formerly Setanta) and TG4 provided live coverage of the league on Saturday nights and Sunday afternoons respectively.
Following the decision to abolish the National Football League semi finals for 2017, the top two teams in Division 1 contest the National Football League final.