Midwest League (1956-Present)
April 5, 2012
Formed: November 28, 1955 – The Mississippi-Ohio Valley League re-brands as the Midwest League First Game: April 29, 1956 Seasons: 70 & Counting (as of 2026)
Sport: Baseball
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Can-Am League (2005-2019)
April 4, 2012
Formed: Disbanded: October 16, 2019 (Merged with and became part of the Frontier League) First Game: Final Game: September 14, 2019 Seasons: 15 States &
New York-Penn League (1957-2019)
March 30, 2012
Formed: 1957 – Re-Branded from the PONY League Dissolved by Major League Baseball: 2020 First Game: Last Game: September 10, 2019 Seasons: 63 States &
Atlantic League (1998-Today)
March 27, 2012
Formed: June 14, 1995 Status: Active Official Website: www.atlanticleague.com First Game: May 20, 1998 (Somerset Patriots @ Atlantic City Surf) Seasons: 25 & counting (as of
Eastern League (1938-Present)
March 27, 2012
Formed: 1937 (Re-branded from New York-Pennsylvania League) Status: Active First Games: April 27, 1938 Seasons: States & Provinces: 15 (CT, MA, MD, ME, NH, NJ,