List of Boston Red Sox minor league affiliates

Geographically, Worcester is Boston's closest domestic affiliate, located approximately 45 miles (72 km) from Fenway Park.

Boston's furthest domestic affiliate is the Fenway South-based FCL Red Sox, located some 1,247 miles (2,007 km) away.

[2] † Open classification (used by the PCL during 1952–1957) Sources:[3][4] The foundation of the minors' current structure was the result of a reorganization initiated by Major League Baseball (MLB) before the 1963 season.

The reduction from six classes to four (Triple-A, Double-AA, Class A, and Rookie) was a response to the general decline of the minors throughout the 1950s and early-1960s when leagues and teams folded due to shrinking attendance caused by baseball fans' preference for staying at home to watch MLB games on television.

The only change made within the next 27 years was some Class A teams adopting "Short Season" schedules starting in 1965.

Sources:[21][22][23][24] For 2020, listed teams are those announced by the Red Sox prior to cancellation of the minor-league season due to the COVID-19 pandemic.