| 1952 | B | Allentown Cardinals, Hagerstown Braves, Harrisburg Senators, Lancaster Red Roses, Salisbury Reds, Sunbury Giants, Wilmington Blue Rocks, York White Roses |
| 1951 | B | Allentown Cardinals, Hagerstown Braves, Harrisburg Senators, Lancaster Red Roses, Salisbury A's, Sunbury Giants, Wilmington Blue Rocks, York White Roses |
| 1950 | B | Allentown Cardinals, Hagerstown Braves, Harrisburg Senators, Lancaster Red Roses, Sunbury A's, Trenton Giants, Wilmington Blue Rocks, York White Roses |
| 1949 | B | Allentown Cardinals, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Sunbury Reds, Trenton Giants, Wilmington Blue Rocks, York White Roses |
| 1948 | B | Allentown Cardinals, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Sunbury Reds, Trenton Giants, Wilmington Blue Rocks, York White Roses |
| 1947 | B | Allentown Cardinals, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Sunbury Yankees, Trenton Giants, Wilmington Blue Rocks, York White Roses |
| 1946 | B | Allentown Cardinals, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Sunbury Yankees, Trenton Giants, Wilmington Blue Rocks, York White Roses |
| 1945 | B | Allentown Cardinals, Hagerstown Owls, Lancaster Red Roses, Trenton Spartans, Wilmington Blue Rocks, York White Roses |
| 1944 | B | Allentown Cardinals, Hagerstown Owls, Lancaster Red Roses, Trenton Packers, Wilmington Blue Rocks, York White Roses |
| 1943 | B | Allentown Wings, Hagerstown Owls, Lancaster Red Roses, Trenton Packers, Wilmington Blue Rocks, York White Roses |
| 1942 | B | Allentown Wings, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Trenton Packers, Wilmington Blue Rocks |
| 1941 | B | Allentown Wings, Bridgeport Bees, Hagerstown Owls, Harrisburg Senators, Lancaster Red Roses, Reading Brooks, Trenton Senators, Wilmington Blue Rocks |
| 1940 | B | Allentown Wings, Harrisburg Senators, Hazleton Mountaineers/Lancaster Red Roses, Reading Chicks, Sunbury Indians, Trenton Senators, Wilmington Blue Rocks, York Bees |
| 1932 | D | Lancaster Red Sox, Norristown/St. Clair Saints, Pottstown Legionaires, Stroudsburg Poconos, Tamaqua/Slatington Dukes, Washington Potomacs |
| 1917 | D | |
| 1916 | D | Bradford Drillers, Erie Sailors, Johnsonburg Johnnies, Olean White Sox, Ridgway, St. Marys Saints, Warren Warriors, Wellsville Rainmakers |
| 1915 | D | Bradford Drillers, Hornell Maple Leafs, Jamestown Rabbits, Olean White Sox, Warren Bingoes, Wellsville Rainmakers |
| 1914 | D | Bradford Drillers, Hornell Green Sox, Jamestown Giants, Olean Refiners, Warren Bingoes, Wellsville Rainmakers |
| 1913 | B | Akron Giants, Canton Senators, Columbus Cubs, Erie Sailors, Steubenville Stubs, Wheeling Stogies, Youngstown Steelmen, Zanesville Flood Sufferers |
| 1909 | D | |
| 1908 | D | Bradford Drillers, Erie Fishermen, Franklin Millionaires, Oil City Cubs, Olean Candidates, Warren Blues |
| 1907 | D | Bradford Drillers, DuBois Miners, Erie Sailors, Franklin Millionaires, Kane Mountaineers, Oil City Oilers, Olean Refiners, Punxsutawney Policemen |
| 1906 | D | Bradford Drillers, DuBois Miners, Erie Sailors, Hornell/Patton Pigmies, Kane Mountaineers, Oil City-Jamestown Oseejays, Olean Refiners, Punxsutawney Policemen |
| 1905 | D | Bradford Drillers, Coudersport Giants, Erie Fishermen, Jamestown Hill Climbers/DuBois Miners, Kane Mountaineers, Olean Refiners |
| 1903 | N/A | Brewton, Mobile, Montgomery Black Sox, Pensacola |
| 1901 | N/A | |
| 1900 | B | Columbus Senators/Anderson Anders, Dayton Veterans, Fort Wayne Indians, Mansfield Haymakers, New Castle Quakers, Toledo Mud Hens, Wheeling Stogies, Youngstown Little Giants/Marion Glass Blowers |
| 1899 | B | Dayton Veterans, Fort Wayne Indians, Grand Rapids Furniture Makers/Springfield Wanderers/Columbus Se, Mansfield Haymakers, New Castle Quakers, Toledo Mud Hens, Wheeling Stogies, Youngstown Little Giants |
| 1898 | B | Dayton Old Soldiers, Fort Wayne Indians, Grand Rapids Cabinet Makers, Mansfield Haymakers, New Castle Quakers, Springfield Governors, Toledo Mud Hens, Youngstown Puddlers |
| 1897 | B | Dayton Old Soldiers, Fort Wayne Indians, Mansfield Haymakers, New Castle Quakers, Springfield Governors, Toledo Mud Hens, Wheeling Nailers, Youngstown Puddlers |
| 1895 | N/A | Canton Deubers, Columbus Statesmen, Findlay Sluggers, Kenton Babes, Lima/Mansfield Kids, Steubenville Stubs/Akron Akrons/Lima Farmers, Twin Cities Hustlers, Wheeling Mountaineers |
| 1894 | N/A | |
| 1891 | N/A | |
| 1890 | N/A | |
| 1888 | N/A | Aurora, Bloomington Reds, Peoria Reds, Terre Haute Hoosiers |
| 1886 | Sp | Aurora, Bloomington Reds, Peoria Reds, Terre Haute Hoosiers |
| 1885 | N/A | Dayton, Erie, Frankfort, Lexington, Springfield, Youngstown |
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