A total of 40 teams will contest the league divided into four groups, Eteläinen (Southern), Pohjoinen (Northern), Läntinen (Western) and Itäinen (Eastern). 30 returning from the 2012 season, two relegated from
Ykkönen and eight promoted from
Kolmonen. The champion of each group will qualify to promotion matches to decide which two teams get promoted to the
Ykkönen. The bottom two teams in each group and the worst eight-placed will qualify directly for relegation to
Kolmonen. Each team will play a total of 27 matches, playing three times against each team of its group.
FC Hämeenlinna and
HIFK were relegated from the
2012 Ykkönen, while
AC Kajaani and
Ilves were promoted to the
2013 Ykkönen.
FC Espoo,
FC Kiffen,
FC Kiisto,
HauPa,
JIlves,
LoPa and
PK-35/VJS were relegated from
2012 Kakkonen.
FC POHU,
Kerho 07,
KäPa,
Masku,
MuSa,
ORPa,
PK Keski-Uusimaa,
Sudet and
Tervarit were promoted from the 2012
Kolmonen.
SiPS didn't take its place in 2013 Kakkonen. Its place was given for
Sporting Kristina, the worst eight-placed of the last season.
ORPa took the place of
FC Santa Claus for the 2013 season when the club went bankrupt after the 2012 season.
Warkaus JK was excluded from the
Kakkonen due to breaking the rules of the association.
Stadia and Locations ==League tables==