The Illinois-Iowa-Indiana or I-I-I League or Three Eye began in 1901. In 1902 it was classified as Class B where it remained until it's demise in 1961
Illinois-Iowa-Indiana (1901)(B 1902-17, 1919-32,
(I-I-I) 1935, 1937-42, 1946-61)
Alton, IL: 1917
Bloomington, IL: 1901-10, 1912-17, 1919-31, 1935, 1937-39
Burlington, IA: 1952-61
Cedar Rapids, IA: 1901-09, 1920-21, 1938-42
Clinton, IA: 1907-08, 1937-41
Danville, IL: 1910-13, 1922-31, 1946-50, 1957
Danville/Moline, IL: 1914
Danville/Springfield, IL: 1932
Davenport, IA: 1901-06, 1909-16, 1946-50, 1958
Decatur, IL: 1901-09, 1912-15, 1922-32, 1935, 1937-42, 1946-50
Des Moines, IA: 1959-61
Dubuque, IA: 1903-14
Dubuque/Freeport, IA/IL: 1915
Evansville, IN: 1901-02, 1919-31, 1938-42, 1946-57, 1959
Ft Wayne, IN: 1935
"Fox-Cities": 1958, 1961
Green Bay, WI: 1958-60
Hannibal, MO: 1916-17
Joliet/Springfield, IL: 1903
Keokuk, IA: 1952-57
Lincoln, NE: 1959-61
Madison, WI: 1940-42
Moline, IL: 1915-17, 1919-23, 1937-41
Peoria, IL: 1905-17, 1920-32, 1935, 1937, 1953-57
"Quad-Cities": 1951-52
Quincy, IL: 1911-17, 1925-32, 1946-56
Rockford, IL: 1901-04, 1915-17, 1919-23
Rock Island, IL: 1901-11, 1916-17, 1920-21
Sioux City, IA: 1959-60
Springfield, IL: 1904-10, 1912-14, 1925-32, 1935, 1938-42, 1946-49
Springfield/Decatur, IL: 1911
Terre Haute, IN: 1901-02, 1919-32, 1935, 1937, 1946-56
Topeka, KN: 1959-61
Waterloo, IA: 1910-11, 1938-42, 1946-56
Winona/Rochester, MN: 1958