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.