The levels
The team file on this site groups full-season clubs as Triple-A, Double-A, High-A, and Single-A, matching the four levels named on MiLB.com.
MiLB
The affiliated clubs that develop players for Major League organizations, from Triple-A through Single-A.
History · Teams · Playoffs · How a player gets there · Contact
MiLB.com says Minor League Baseball was founded in 1901, is headquartered in New York, and is the developmental system for Major League Baseball.
The same page says full-season clubs are spread across Triple-A, Double-A, High-A, and Single-A, and that players are assigned by major league organizations. There are no open tryouts for a minor league club.
120 clubs from the published list. Open a club for its desk. Full-season clubs from the MiLB team list.
MiLB.com’s March 2026 announcement says the Triple-A season is split in two. The first half ends June 21 and the second half starts June 23. The regular season ends September 20.
The first-half winner in each Triple-A league hosts a best-of-three league championship series. Those two champions meet in the Triple-A National Championship Game. In 2026 that game is September 26 at Las Vegas Ballpark.
MiLB.com’s playoff procedures, written for the 2025 postseason, say Double-A, High-A, and Single-A send four clubs: each division’s winner from each half of the season. If one club wins both halves, the next-best club from the second half goes instead. Those four play a best-of-three division series, then a best-of-three championship series.
The same page makes one exception. The Northwest League has six clubs, so it plays a single best-of-five championship series between the two half winners.
MiLB.com says players are typically scouted in high school or college, then selected in the MLB Draft or signed as undrafted or international free agents. A major league organization assigns the player to an affiliate.
On the field, each full-season league plays for its own championship. At Triple-A, the International League champion and the Pacific Coast League champion then play one game, the Triple-A National Championship, for the title at the highest level of the minors.
MiLB.com
milb.com/about
The team file on this site groups full-season clubs as Triple-A, Double-A, High-A, and Single-A, matching the four levels named on MiLB.com.
The standings file on this site publishes Triple-A tables for the International League and the Pacific Coast League, and Double-A and High-A tables for the leagues on that file.
Each full-season club is an affiliate of a major league organization. The parent club, not an open tryout, puts the player on the roster.
MiLB.com also names rookie leagues in Arizona, Florida, and the Dominican Republic. Those clubs are not in the full-season list on this desk.