Iowa State League was a Class D League from 1905-1906. in 1907 the league change is name to Central Association, a Class D League and before the Iowa State League started, it was called Iowa State Association,1904, a Class D League.
Iowa State league was an Independent League that played in 1895, 1911-1912 and 1950-1955
1895 Burlignton IA, Cedar Rapids IA, Dubuque Ia, Ottumwa IA
1904 Boone IA, Burlington IA, Ft Dodge IA, Keokuk IA, Marshalltown IA, Oskaloosa IA, Ottumwa IA, and Waterloo IA.
1905 No teams entered the league or left the league.
1906 Boone, IA move to Clinton, IA during the season
1907 Jacksonville, IL and Quincy, IL entered the league; Clinton and Ft Dodge left the league.
1912 Clear Lake IA, Emmestburg IA, Esterville IA, Ft Dodge IA, and Mason City IA.
1949 Brancorft, Carroll, Lakes, Marshalltown, Mason City, Spencer
1950 Aubudon, Brancroft, Carroll, Esterville, Fonda, Lakes, Mason City, Schaller, Spencer, Storm Lake.
1951 Aubudon, Fonda and Schaller left the league and Lakes move to Denson during the season.
1952 Wall Lake entered the league; Brancroft left the league.
1953 Storm Lake entered the league; Wall Lake left the league.
1954 No team entered or left the league.
1955 Brancroft entered the league.
NOTE 1 - Bold Means unknowkn Location
NOTE 2 - Unsure but i think theteams that played in 1895 where also played in the Eastern Iowa League