Minor League Baseball

Minor League Baseball (MiLB) is a hierarchy of professional baseball leagues in the Americas that compete at levels below Major League Baseball (MLB) and help prepare players to join major league teams. All of the minor leagues are operated as independent businesses. Most are members of the umbrella organization formally known as National Association of Professional Baseball Leagues (NAPBL), which operates under the Commissioner of Baseball within the scope of organized baseball. Several leagues, known as independent baseball leagues, have no official links to Major League Baseball.

All MiLB teams

Active teams

Major League Club	Level	Affiliate	City	Venues
Chicago Cubs	AAA	Iowa Cubs	Des Moines, Iowa	Principal Park (1992-present) Sec Taylor Stadium (1969-91)
Cleveland Indians	AA	Akron RubberDucks	Akron, Ohio	Canal Park (1997-present)
Houston Astros	AAA	Round Rock Express	Round Rock, Texas	Dell Diamond (2000-present)
Minnesota Twins	AAA	Rochester Red Wings	Rochester, New York	Frontier Field (1997-present) Silver Stadium (1929-96) Bay Street Ball Grounds (1908-28) Culver Field (1899-1907)
Pittsburgh Pirates	AAA	Indianapolis Indians	Indianapolis, Indiana	Victory Field (1996-present) Bush Stadium (1931-96)
Toronto Blue Jays	AAA	Buffalo Bisons	Buffalo, New York	Sahlen Field (1988-present) War Memorial Stadium (1979-87)

Defunct teams

Team	Years Active	Level	City	Venues
Calgary Cannons	1985-2002	AAA	Calgary, Alberta	Foothills Stadium
Toronto Maple Leafs	1896-1967	AAA	Toronto, Ontario	Maple Leaf Stadium (1926-67) Hanlan's Point Stadium (1897-1900; 1908-25) Diamond Park (1901-07,1909) Sunlight Park (1886-97) Jarvis Street Lacrosse Grounds (1885)

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