A total of 40 teams will contest the league divided into four groups, Eteläinen (Southern), Pohjoinen (Northern), Läntinen (Western) and Itäinen (Eastern).
29 returning from the 2014 season, two relegated from Ykkönen and nine promoted from Kolmonen.
The bottom three teams in each group and the worst seventh-placed will qualify directly for relegation to Kolmonen.
[2] Group winners Eteläinen (Southern): FC Honka Pohjoinen (Northern): KPV Läntinen (Western): GrIFK Itäinen (Eastern): Klubi-04 KPV won 2–1 on aggregate.
At the end of the season, a comparison is made between the seventh-placed teams.