All teams to ever have won the Swedish Championship in Football.
1896-1925 Svenska Mästerskapet
1926-1930 No champions awarded
1931-1981 Allsvenskan
1982-1990 Allsvenskan Playoffs
1991-1992 Mästerskapsserien
1993- Allsvenskan
Source: Wikipedia
The number in parantheses is how many championships each team has won at the time