Ohio State League was an independent league - 1884, 1886-87, 1889, 1893, 1897, 1899, 1935  and Class D - 1908-1916, 1936-1941, 1944-1951 and Class F - 1898.

1884     Chillicothe OH, Dayton OH, Hamilton OH, Ironton OH, Portsmouth OH, Springfield OH

1885     Not sure if this league played

1886     Cincinnati OH, Columbus OH, Richmond IN, Washington Court House OH

1887     Akron OH, Columbus OH, Kalamazoo MI, Mansfield OH, Sandusky OH, Steubenville OH, Wheeling WV, Zanesville OH, Canton OH

1888     Not sure if this league played

1889     Akron Oh, Newark OH, Tiffin OH, Youngstown OH

1890 to 1982     Not sure if this league played

1893     Akron OH, Canton OH, Mansfield OH, Sandusky OH, Springfield OH

1894 to 1896     Not sure if this league played

1897     Akron OH, Canton OH, Chillicothe OH, Cincinnati OH, Dover OH, New Philadelphia OH

1898     Canton OH, Coshocton OH, Massillion OH, Salem OH, Wheeling WV, Zanesville OH

1899     Cambridge OH, Ravenna OH and Uhrichsville OH entered the league; Salem left the league.

1900 to 1908   Not sure if this league played

1908     Lancaster OH, Lima OH, Mansfield OH, Marion OH, Newark OH, Springfield Oh. During the season, Springfield team moved to Portsmoth OH.

1909     No team entered or left the league.

1910     Chillicothe, OH entered the league; Mansfield left the league.

1911     Hamilton, OH and Springfield, OH entered the league.  During the season, Newark franchise played some home games in Piqua, OH.

1912     Mansfield, Hamilton, Lancaster and Springfield left the league.   During the season the Marion franchise move to Ironton, OH.

1913     Charleston WV, Hamilton OH, Hungtington WV, Lexington, Ky and Maysville, Ky entered the league; Lima, Mansfield and Newark left the league.

1914     Newport, Ky entered the league; Hamilton left the league. During the season , Newport franchise moved to Paris, KY.

1915     Frankfort, KY entered the league; Huntington, Maysville and Paris left the league.  During the season, Chillicothe moved to Huntington, WV and then to Maysville, Oh.

1916     Huntington, WV entered the league; Ironton left the league. During the season, Charleston franchise moved to Chillicothe, OH.

1935     Alliance OH, Canton OH, Cleveland OH, Mansfield OH, New Philadelphia OH, Tiffin OH

1936     Fostoria OH, Fremont OH and Sandusky, OH entered the league; Alliance, Canton and Cleveland left the league.

1937     Findlay, Oh entered the league; New Philadelphia left the league.  During the season, Sandusky franchise moved to Marion OH.

1938     Mansfield and Marion left the league.

1939     Lima, OH and Mansfield, OH entered the league.

1940     No teams entered or left the league.

1941     No teams entered or left the league.

1944     Lima OH, Marion OH, Middletown OH, Newark OH, Springfield OH, Zanesville OH

1945     No teams entered or left the league

1946     Dayton OH and Richmond, IN In entered the league.

1947     Muncie, IN entered the league; Middletown left the league.

1948     See Ohio-Indiana League from 1948 to 1951.

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