List of Athletics minor league affiliates

The Athletics farm system consists of six Minor League Baseball affiliates across the United States and in the Dominican Republic. Four teams are independently owned, while two—the Arizona Complex League Athletics and Dominican Summer League Athletics—are owned by the major league club.

The Athletics have been affiliated with the Double-A Midland RockHounds of the Texas League since 1999, making it the longest-running active affiliation in the organization among teams not owned by the Athletics. The longest affiliation in team history was the 30-year relationship with the Class A-Advanced California League's Modesto A's from 1975 to 2004. Their newest affiliate is the Lansing Lugnuts of the Midwest League, which became the Athletics' High-A club in 2021.

Geographically, the Athletics' closest domestic affiliate is the Single-A Stockton Ports of the California League, which are approximately away. Their furthest domestic affiliate is the Lansing Lugnuts, which are approximately away.

Current affiliates

The Athletics farm system consists of six minor league affiliates.

ClassTeamLeagueLocationBallparkAffiliated Triple-A Las Vegas Aviators Pacific Coast League Summerlin, Nevada Las Vegas Ballpark 2019 Double-A Midland RockHounds Texas League Midland, Texas Momentum Bank Ballpark 1999 High-A Lansing Lugnuts Midwest League Lansing, Michigan Jackson Field 2021 Single-A Stockton Ports California League Stockton, California Banner Island Ballpark 2005 Rookie ACL Athletics Arizona Complex League Mesa, Arizona Fitch Park 1988 DSL Athletics Dominican Summer League Boca Chica, Santo Domingo Juan Marichal Complex 1989

Past affiliates

Key SeasonEach year is linked to an article about that particular Athletics season.

1923–1962 Minor League Baseball operated with five classes (Double-A, Class A, Class B, Class C, and Class D) from 1923 to 1935. Class A1, between Double-A and Class A, was added in 1936. The minors continued to operate with these six levels through 1945. Triple-A was established as the highest classification in 1946, and Class A1 became Double-A, with Class A through D remaining. These six levels continued through 1962. The Pacific Coast League (PCL) was reclassified from Triple-A to Open in 1952 due to the possibility of becoming a third major league. This arrangement ended following the 1957 season when the relocation of the National League's Dodgers and Giants to the West Coast ended any chance of the PCL being promoted.

SeasonTriple-A Double-AClass AClass BClass CClass D 1923 — — Shreveport Gassers — — — 1924 — — Shreveport Gassers — — — 1925 — — — — — — 1926 — — — — — — 1927 — — — — — — 1928 — — — — — — 1929 — — — — — — 1930 — — — — — — 1931 — — — — — — 1932 — Portland Beavers — — — — 1933 — — Williamsport Grays — — — 1934 — — Williamsport Grays — — — 1935 — — Williamsport Grays Richmond Colts — — 1936 — — Williamsport Grays Richmond Colts Cleveland A's — 1937 — — Williamsport Grays — — Federalsburg A's 1938 — — Williamsport Grays — — Federalsburg A'sLexington Indians 1939 — — Williamsport Grays — — Abbeville A'sFederalsburg A'sLexington Indians 1940 — Toronto Maple Leafs Williamsport Grays Wilmington Blue Rocks — Federalsburg A's 1941 — Toronto Maple Leafs Williamsport Grays Wilmington Blue Rocks Newport News Pilots Federalsburg A's 1942 — — Williamsport Grays Wilmington Blue Rocks Newport News Builders — 1943 — — Elmira Pioneers Wilmington Blue Rocks — — 1944 — — Elmira Pioneers Lancaster Red Roses — — 1945 — Toronto Maple Leafs — Lancaster Red Roses Martinsville A's Lexington A's 1946 Toronto Maple Leafs — Savannah Indians Lancaster Red Roses Kingston PoniesMartinsville A's Federalsburg A'sLexington A's 1947 — Birmingham Barons Lincoln A'sSavannah Indians Lancaster Red Roses Martinsville A'sMoline A'sNiagara Falls Frontiers Federalsburg A'sLexington A'sNyack RocklandsRed Springs Red RobinsWelch Miners 1948 — — Lincoln A'sSavannah Indians — Martinsville A'sMoline A's / Kewanee A's Federalsburg A'sLexington A'sMoultrie A'sPortsmouth A'sRed Springs Red RobinsWelch Miners 1949 — — Lincoln A'sSavannah Indians Martinsville A's Kewanee A'sYoungstown A's Lexington A'sMoultrie A'sPortsmouth A'sRed Springs Red RobinsTarboro A'sWelch Miners 1950 Buffalo Bisons — Lincoln A'sSavannah Indians Fayetteville A'sSunbury A'sWest Palm Beach Indians Youngstown A's Cordele A'sLexington A'sPortsmouth A'sRed Springs Red RobinsTarboro A'sWelch Miners 1951 — — Lincoln A'sSavannah Indians Fayetteville A'sSalisbury A's Rome Colonels Cordele A'sCorning A'sLexington Indians 1952 Ottawa A's — Lincoln A'sSavannah Indians Fayetteville A'sHarrisburg Senators St. Hyacinthe A's Cordele A'sCorning A'sLexington Indians 1953 Ottawa A's — Savannah IndiansWilliamsport A's Fayetteville Highlanders St. Hyacinthe A's Cordele A'sHopkinsville HoppersWelch Miners 1954 Ottawa A's — Savannah A's Lancaster Red Roses Drummondville A's Hopkinsville HoppersWelch Miners 1955 Columbus Jets — Savannah A's Lancaster Red Roses Burlington A'sHot Springs Bathers Welch Miners / Marion A'sSeminole Oilers 1956 Columbus Jets — Columbia Gems Abilene Blue Sox Crowley MillersPocatello Bannocks Fitzgerald A'sGrand Island A'sSeminole Oilers 1957 Buffalo Bisons Little Rock Travelers Columbia Gems Abilene Blue Sox Crowley MillersPocatello A's Grand Island A'sMattoon AthleticsSeminole Oilers 1958 Buffalo Bisons Little Rock Travelers Albany Senators Rochester A's / Winona A's Pocatello A's Grand Island A'sPlainview A'sSelma Cloverleafs 1959 Portland Beavers Shreveport Sports Albany Senators Sioux City Soos Pocatello A's Grand Island A'sOlean A'sPlainview A's 1960 Dallas-Fort Worth Rangers Shreveport Sports — Lewiston BroncsSioux City Soos Visalia A's Albuquerque DukesSanford Greyhounds 1961 Hawaii Islanders Shreveport Sports Portsmouth-Norfolk Tides Lewiston Broncs Pocatello BannocksVisalia A's Albuquerque DukesSarasota Sun Sox 1962 Portland Beavers Albuquerque Dukes Binghamton Triplets Lewiston Broncs Minot Mallards Daytona Beach Islanders

1963–1989 Prior to the 1963 season, Major League Baseball (MLB) initiated a reorganization of Minor League Baseball that resulted in a reduction from six classes to four (Triple-A, Double-A, Class A, and Rookie) in 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 Class A being subdivided for the first time to form Class A Short Season in 1966.

SeasonTriple-ADouble-AClass AClass A Short SeasonRookie 1963 Portland Beavers Binghamton Triplets Burlington BeesDaytona Beach IslandersLewiston Broncs — — 1964 Dallas Rangers Birmingham Barons Burlington BeesDaytona Beach IslandersLewiston Broncs — Wytheville A's 1965 Vancouver Mounties Birmingham Barons Burlington BeesLeesburg A'sLewiston BroncsShelby Rebels — — 1966 Vancouver Mounties Mobile A's Burlington BeesLeesburg A'sModesto Reds Lewiston Broncs — 1967 Vancouver Mounties Birmingham A's Burlington BeesLeesburg A'sPeninsula Grays — GCL Athletics 1968 Vancouver Mounties Birmingham A's Burlington BeesLeesburg A'sPeninsula Grays — GCL Athletics 1969 Iowa Oaks Birmingham A's Burlington BeesLodi Crushers Tri-City A's — 1970 Iowa Oaks Birmingham A's Burlington Bees Coos Bay-North Bend A's — 1971 Iowa Oaks Birmingham A's Burlington Bees Coos Bay-North Bend A's — 1972 Iowa Oaks Birmingham A's Burlington Bees Coos Bay-North Bend A's — 1973 Tucson Toros Birmingham A's Burlington Bees Lewiston Broncs — 1974 Tucson Toros Birmingham A's Burlington Bees Lewiston Broncs — 1975 Tucson Toros Birmingham A's Modesto A's Boise A's — 1976 Tucson Toros Chattanooga Lookouts Modesto A's Boise A's — 1977 San Jose Missions Chattanooga Lookouts Modesto A's — Medicine Hat A's 1978 Vancouver Canadians Jersey City A's Modesto A's Bend Timber Hawks — 1979 Ogden A's Waterbury A's Modesto A's Medford A's — 1980 Ogden A's West Haven Whitecaps Modesto A's Medford A's — 1981 Tacoma Tigers West Haven A's Modesto A's Medford A's — 1982 Tacoma Tigers West Haven A's Madison MuskiesModesto A's Medford A's Idaho Falls A's 1983 Tacoma Tigers Albany A's Madison MuskiesModesto A's Medford A's Idaho Falls A's 1984 Tacoma Tigers Albany-Colonie A's Madison MuskiesModesto A's Medford A's Idaho Falls A's 1985 Tacoma Tigers Huntsville Stars Madison MuskiesModesto A's Medford A's Pocatello Gems 1986 Tacoma Tigers Huntsville Stars Madison MuskiesModesto A's Medford A's — 1987 Tacoma Tigers Huntsville Stars Madison MuskiesModesto A's Medford A's — 1988 Tacoma Tigers Huntsville Stars Madison MuskiesModesto A's Southern Oregon A's AZL Athletics 1989 Tacoma Tigers Huntsville Stars Madison MuskiesModesto A's Southern Oregon A's AZL AthleticsDSL Athletics

1990–2020 Minor League Baseball operated with six classes from 1990 to 2020. In 1990, the Class A level was subdivided for a second time with the creation of Class A-Advanced. The Rookie level consisted of domestic and foreign circuits.