Southern Wisconsin League was an independent league based in Wisconsin. 

1893     Fort Atkinson, Janesville, Madison, Oconomowoc, Whitewater, Waukesha

1923     Cambridge, Deerfield, Edgeville, Fort Atkinson, Janesville, Madison, Perry, Stoughton

1924     Brodhead, Cambridge, Edgertown, Fort Atkinson, Janesville, Milton

1925     Albany, Brodhead, Edgeton, Footville, Jamesville, Milton

1926     Albany, Brodhead, Edgerton, Evansville, Footville, Janesville, Milton

1927 to 1930   Not sure if this league played

1931     Albany, Clinton, Evansville, Footville, Janesville, Orfordville

1932     Stoughton enter the league and Clinton has left the League

1933 to 1935   Not sure if this league played

1936     Algoma, Institute, Little Sturgeon, North Sawyer, Maplewood, Vignes

NOTE 1 - Bold means unknown Location

NOTE 2 - not sure why they called the 1936 league, Southern Wisconsin, since all the teams are in the Northeast part of Wisconsin and might have been called Southern Door County League but not sure.