This list compiles the history of their minor league affiliates since the re-organization of the Minor League classification season prior to the 1963 season.
1962 and prior years
Organized baseball reclassified its minor league system prior to the 1963 season. The classification of leagues as B, C, D, and E changed to the current A-based rankings: AAA, AA, A, short-season A, and Rookie-Advanced. Many leagues were reclassified. Class D day would be equivalent to the Rookie level today.