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The American Association of Professional Baseball is a professional baseball Partner League of MLB, founded in 2005. As a Partner League, the American Association collaborates with MLB on initiatives to provide organized baseball to communities throughout the United States and Canada.

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The Frontier League is an MLB Partner League with 16 member clubs in the Northeastern and Midwestern United States, and Eastern Canada. Formed in 1993, it is the oldest currently operating professional independent baseball league in the United States. As a Partner League, the Frontier League collaborates with MLB on initiatives to provide organized baseball to communities throughout the United States and Canada while working to expand the geographic reach of the game.


atlantic league

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 corporate headquarters is in Lancaster, PA.



The Pioneer League is an independent baseball league that operates in the Rocky Mountain region of the United States. Its teams are not directly affiliated with Major League Baseball (MLB). It is designated as an MLB Partner League.

From 1939 to 2020, the Pioneer League was affiliated with Minor League Baseball and its teams were affiliated with MLB teams. It operated as a Class C league from 1939 to 1942 and from 1946 to 1962. It was elevated to Class A for 1963 and was a Rookie-level league from 1964 to 2020.



The Northwoods League is the proven leader in the development of elite college baseball players. The 2024 season will mark the 31st season of the Northwoods League. It is the largest organized baseball league in the world with 23 teams, drawing significantly more fans, in a friendly ballpark experience, than any league of its kind. A valuable training ground for coaches, umpires and front office staff, over 310 Northwoods League players have advanced to Major League Baseball.


WESt coast league

The West Coast League (WCL) is the premier summer collegiate baseball league west of the Mississippi. Situated in the beautiful Pacific Northwest, the seventeen-year-old, fifteen-team, professionally operated wood-bat league showcases pro prospects from major conferences around the nation. Every summer, the league features unparalleled fan and player experiences, with the best summer weather in North America. 


Wendelstedt Umpire School

The Wendelstedt Umpire School is an umpire training school located in Ormond Beach, Florida. It runs for five weeks each year from early January through early February. The school was previously known as the Bill McGowan School for Umpires and the Al Somers Umpire School. The Wendelstedt Umpire School has produced more MLB umpires than all other schools in history combined. It has fourteen full-time MLB umpires and a number of minor league umpires on its staff. 


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PLAY treasure coast sports commission

Play Treasure Coast Sports Tourism, formerly known as the Treasure Coast Sports Commission, offers event owners and managers access to world class sport facilities, special pricing on hotels from our partners and grants to help fund your event. Located on the East Central Coast of Florida, comprising of Indian River, St. Lucie and Martin Counties,



The nation's leading supplier of officiating gear. Get all of your officiating gear in one place for low prices! Purchase Officials is dedicated to bringing customers the highest quality gear, apparel and customer service. On-field supplier of apparel for the Umpire Placement Course, and official on-field supplier of uniforms for the Northwoods League and West Coast League.

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