Three-I League history
| Unclassified | 1901 |
| Class B | 1902-1917; 1919-1932; 1935; 1937-1942; 1946-1961 |
Teams (in alphabetical order)
Alton Blues, 1917
Bloomington Bengals, 1937
Bloomington Bloomers, 1903-1910, 1912-1917, 1919-1929, 1935, 1938-1939
Bloomington Cubs, 1930-1931
Bloomington Blues, 1901-1902
Burlington Bees, 1954-1961
Burlington Flints, 1952-1953
Cedar Rapids Braves, 1958-1961
Cedar Rapids Indians, 1950-1954
Cedar Rapids Raiders, 1938-1942, 1957
Cedar Rapids Rabbits, 1901-1909, 1920-1921
Clinton Giants, 1939-1941
Clinton Infants, 1907-1908
Clinton Owls, 1937-1938
Danville Dodgers, 1946-1950
Danville Speakers, 1910-1914
Danville Veterans, 1922-1932
Davenport Blue Sox, 1913-1916
Davenport Cubs, 1946-1947
Davenport DavSox, 1957-1958
Davenport Knickerbockers, 1906
Davenport Pirates, 1948-1949
Davenport Prodigals, 1909-1912
Davenport Quads, 1950
Davenport River Rats, 1901-1904
Davenport Riversides, 1905
Davenport Tigers, 1951-1952
Decatur Commies, 1948
Decatur Commodores, 1901-1909, 1912-1915, 1922-1932, 1935, 1937-1942, 1946-1947, 1950
Decatur Cubs, 1949
Decatur Nomads, 1911
Des Moines Demons, 1959-1961
Dubuque Shamrocks, 1903-1905
Dubuque Dubs, 1906-1910, 1912-1915
Dubuque Hustlers, 1911
Evansville Bees, 1938-1942
Evansville Braves, 1946-1957
Evansville Evas, 1919-1923
Evansville Little Evas, 1924
Evansville Hubs, 1926-1931
Evansville Pocketeers, 1925
Evansville River Rats, 1901-1902
Fort Wayne Chiefs, 1935
Fox Cities Foxes, 1959-1961
Freeport Comeons, 1915
Green Bay Bluejays, 1958-1959
Green Bay Dodgers, 1960
Hannibal Mules, 1916-1917
Joliet Standards, 1903
Keokuk Kernels, 1952-1957
Lincoln Chiefs, 1959-1961
Madison Blues, 1940-1942
Moline Plowboys, 1914-1917, 1919-1923, 1937-1941
Peoria Chiefs, 1953-1957
Peoria Distillers, 1905-1917
Peoria Reds, 1937
Peoria Tractors, 1919-1932, 1935
Quincy Gems, 1913-1917, 1946-1956
Quincy Indians, 1928-1932
Quincy Infants, 1911
Quincy Old Soldiers, 1912
Quincy Red Birds, 1925-1927
Rochester A’s, 1958
Rock Island Islanders, 1901-1911, 1916-1917, 1921
Rockford Red Sox, 1901-1904
Rockford Rox, 1917, 1919-1923
Rockford Wakes, 1915-1916
Sioux City Soos, 1959-1960
Springfield Browns, 1938-1942, 1946-1949
Springfield Foot Trackers, 1903
Springfield Hustlers, 1904
Springfield Senators, 1905-1912, 1925-1932, 1935
Springfield Watchmakers, 1913-1914
Terre Haute Browns, 1919-1920
Terre Haute Hottentots, 1901-1902
Terre Haute Phillies, 1946-1954
Terre Haute Tigers, 1955-1956
Terre Haute Tots, 1921-1932, 1935, 1937
Topeka Hawks, 1959
Topeka Reds, 1960-1961
Waterloo Boosters, 1910-1911
Waterloo Hawks, 1940-1942, 1947
Waterloo Red Hawks, 1938-1939
Waterloo White Hawks, 1946, 1948-1956
Winona A’s, 1958