There are 14 Minor League Baseball (MiLB) leagues and 206 teams in operation across the United States, Dominican Republic, and Canada, which are affiliated with Major League Baseball (MLB) teams. They are organized by one of five classes (from highest to lowest): Triple-A, Double-A, High-A, Single-A, and Rookie. Of these, 120 teams in 11 leagues (from Triple-A to Single-A) are each affiliated with one MLB team through a standardized professional development license. Additionally, three leagues consisting of a total of 85 Rookie teams are located at MLB

spring training Spring training is the preseason in Major League Baseball (MLB), a series of practices and exhibition games preceding the start of the regular season. Spring training allows new players to try out for Schedule (workplace), roster and position spo ...

complexes in Arizona and Florida, as well as in the Dominican Republic. These affiliated leagues contest their seasons during the MLB season. The Arizona Fall League, consisting of six teams, operates in the autumn after the conclusion of the MiLB and MLB seasons to develop top prospects at various classifications. Seven

independent baseball league An independent baseball league is a professional baseball organization in the United States or Canada that is not overseen by Major League Baseball and is outside the Minor League Baseball clubs affiliated to it. The Northern League and Frontie ...

s, consisting of a total of 69 teams, have no direct affiliation with Major League Baseball, though the American Association, Atlantic League, Frontier League, and Pioneer League are designated MLB Partner Leagues.

Leagues affiliated with Major League Baseball

Triple-A leagues

The Triple-A classification is the highest level of play in Minor League Baseball, just below Major League Baseball. A total of 30 affiliated teams compete at this level, with 20 teams in the

International League The International League (IL) is a Minor League Baseball league that operates in the United States. Along with the Pacific Coast League, it is one of two leagues playing at the Triple-A level, which is one grade below Major League Baseball ...

and 10 teams in the

Pacific Coast League The Pacific Coast League (PCL) is a Minor League Baseball league that operates in the Western United States. Along with the International League, it is one of two leagues playing at the Triple-A (baseball), Triple-A level, which is one grade bel ...

International League

Pacific Coast League

Double-A leagues

The Double-A classification is the second-highest level of play in Minor League Baseball. A total of 30 teams compete at this level, with 12 teams in the Eastern League, 8 teams in the Southern League, and 10 teams in the Texas League.

Eastern League

Southern League

Texas League

High-A leagues

High-A is the third-highest level of play in Minor League Baseball. A total of 30 teams compete at this level, with 12 teams in the Midwest League, 12 teams in the South Atlantic League, and 6 teams in the Northwest League.

Midwest League

South Atlantic League

Northwest League

Single-A leagues

Single-A is the fourth-highest level of play in Minor League Baseball. A total of 30 teams compete at this level, with 12 teams in the Carolina League, 10 teams in the

Florida State League The Florida State League (FSL) is a Minor League Baseball league based in the state of Florida. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following ...

, and 8 teams in the

California League The California League is a Minor League Baseball league that operates in California. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following Major Leag ...

Carolina League

Florida State League

California League

Rookie leagues

The Rookie classification is the lowest level of play in Minor League Baseball. A total of 85 teams compete at this level, with 18 teams in the Arizona Complex League, 20 teams in the Florida Complex League, and 47 teams in the Dominican Summer League.

Arizona Complex League

Florida Complex League

Dominican Summer League

Fall leagues

Arizona Fall League

The Arizona Fall League, an off-season league owned and operated by Major League Baseball, consists of six teams in the state of Arizona.

MLB Partner Leagues

MLB Partner Leagues consist of 45 teams with no direct affiliation with individual MLB organizations, but collaborate on promoting the sport in North America. Three leagues, the American Association, Atlantic League, and Frontier League, had been fully independent leagues, while the Pioneer League had previously been a Rookie-classification affiliated league.

American Association of Professional Baseball

The American Association of Professional Baseball consists of 12 teams.

Atlantic League of Professional Baseball

The

Atlantic League of Professional Baseball The Atlantic League of Professional Baseball (ALPB) is a professional independent baseball league based in the United States. It is an official MLB Partner League based in the Mid-Atlantic and Southeastern United States. The Atlantic League's ...

consists of 10 teams.

Frontier League

The Frontier League consists of 16 teams.

Pioneer League

The Pioneer League consists of 10 teams.

Non-partner independent leagues

Empire Professional Baseball League

The independent Empire Professional Baseball League consists of 4 teams.

Pecos League

The independent Pecos League consists of 16 teams.

United Shore Professional Baseball League

The independent, single-site United Shore Professional Baseball League consists of four teams.

References

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