There are 14 Minor League Baseball (MiLB) leagues and 202 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. [ 1 ] Additionally, three leagues consisting of a total of 82 Rookie teams are located at MLB spring training complexes in Arizona [ 2 ] and Florida , [ 3 ] as well as in the Dominican Republic. [ 4 ] 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. Ten independent baseball leagues , consisting of a total of 101 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 and the MLB Draft League is an MLB-associated showcase league. [ 5 ] Leagues affiliated with Major League Baseball Triple-A leagues The Triple-A classification is the highest level of play in MiLB, just below MLB. A total of 30 affiliated teams compete at this level, with 20 teams in the International League and 10 teams in the Pacific Coast League . [ 6 ] 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 . [ 6 ] Southern League 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 . [ 6 ] 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 , and 8 teams in the California League . [ 6 ] Carolina League Florida State League California League 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 , [ 7 ] 20 teams in the Florida Complex League , [ 8 ] and 47 teams in the Dominican Summer League . [ 9 ] Arizona Complex League Florida Complex League Dominican Summer League 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 . [ 10 ] Each team is affiliated with five MLB organizations. MLB Partner Leagues MLB Partner Leagues consist of 50 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; a fourth, the Pioneer League, had previously been affiliated with Minor League Baseball as a "Rookie Advanced" league, the second-lowest rung on the minor league ladder. Additionally, MLB supports a 6-team showcase league for future and newly professional prospects called the MLB Draft League; all teams in the MLB Draft league were formerly Minor League Baseball teams. American Association of Professional Baseball The American Association of Professional Baseball consists of 12 teams. [ 11 ] Atlantic League of Professional Baseball The Atlantic League of Professional Baseball consists of 10 teams. [ 12 ] Frontier League The Frontier League consists of 18 teams. [ 13 ] The Pioneer League consists of 12 teams. MLB Draft League The MLB Draft League is a hybrid amateur–professional showcase league supported by MLB but run independently. During the first half of each season, the league operates as an amateur collegiate summer baseball league; [ 14 ] after a break for each July's MLB draft , play resumes for the season's remaining games with paid professional players who have exhausted their amateur eligibility. [ 15 ] Non-partner independent leagues Canadian Baseball League The Canadian Baseball League consists of 9 teams, all in Southern Ontario ; from 1919 until 2025, it operated as a semi-professional league known as the Intercounty Baseball League. [ 16 ] Empire Professional Baseball League The independent Empire Professional Baseball League consists of 4 teams. [ 17 ]

The independent Pecos League consists of 16 teams. [ 18 ] United Shore Professional Baseball League The independent, single-site United Shore Professional Baseball League consists of four teams. [ 19 ] Women's Pro Baseball League The Women's Pro Baseball League is an independent, professional women's baseball league that will begin play in 2026. All 4 teams, which have yet to be given home stadiums, will play their inaugural season in a single stadium in Illinois . [ 20 ] Baseball portal List of developmental and minor sports leagues List of professional sports leagues#Americas List of defunct professional sports leagues Minor League Baseball rosters ↑ "MiLB Teams by Affiliate: Team Names and Logos for each Club | Minor League Baseball" . MLB.com . Retrieved April 30, 2026 . ↑ "About the Arizona Complex League | Minor League Baseball" . MLB.com . Retrieved April 30, 2026 . ↑ "About the Florida Complex League | Minor League Baseball" . MLB.com . Retrieved April 30, 2026 . ↑ "About the Dominican Summer League | Minor League Baseball" . MLB.com . Retrieved April 30, 2026 . ↑ "American Association, Frontier League Now MLB Partner Leagues" . Ballpark Digest . August Publishing. September 24, 2020 . Retrieved October 13, 2020 . 1 2 3 4 Mayo, Jonathan (February 12, 2021). "MLB Announces New Minors Teams, Leagues" . Major League Baseball . Retrieved February 12, 2021 . ↑ "Arizona League Divisions" . Arizona League . Minor League Baseball . Retrieved May 28, 2021 . ↑ "Gulf Coast League Divisions" . Gulf Coast League . Minor League Baseball . Retrieved May 28, 2021 . ↑ "Dominican Summer League Rosters" . Minor League Baseball . Retrieved October 17, 2020 . ↑ "About" . Arizona Fall League . Major League Baseball . Retrieved October 13, 2020 . ↑ "American Association Announces 2021 Schedule" . American Association of Independent Professional Baseball . Archived from the original on February 8, 2021 . Retrieved February 22, 2021 . ↑ "League Directory" . Atlantic League of Professional Baseball . Retrieved October 13, 2020 . ↑ "2024 Frontier League Media Guide" (PDF) . frontierleague.com . Frontier League. pp. 14– 74 . Retrieved August 30, 2024 . ↑ Reichard, Kevin (November 30, 2020). "Kerrick Jackson is New MLB Draft League President" . Ballpark Digest . August Publications . Retrieved November 30, 2020 . ↑ "What is the MLB Draft League" . MLBDraftLeague.com . MLB Draft League . Retrieved June 25, 2023 . ↑ "A New Era for Independent Professional Baseball in Canada Begins" . Retrieved November 24, 2025 . ↑ "Teams" . Empire Professional Baseball League . Retrieved October 13, 2020 . ↑ "Home" . Pecos League . Retrieved April 22, 2021 . ↑ "Teams" . United Shore Professional Baseball League . Retrieved October 13, 2020 . ↑ Reynolds, Geno (November 17, 2025). "Robin Roberts Stadium named official venue of the WPBL 2026 season" . NewsChannel 20 . Sinclair Broadcast Group . Retrieved November 17, 2025 . Minor league baseball teams Independent league baseball teams Minor League Baseball lists Minor league baseball leagues Lists of baseball teams Articles with short description Short description is different from Wikidata Use American English from February 2026 All Wikipedia articles written in American English Use mdy dates from February 2026