American Association (1882-1891)
January 21, 2026
Formed: October 10, 1881 Disbanded: December 18, 1891(National League Absorbs AA First Games: May 2, 1882 Last Games: October 6, 1891 Seasons: 10 States: 11 (DC, IN, KY,
Sport: Baseball
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Denver Zephyrs
December 1, 2025
The Denver Zephyrs were formerly known as the Denver Bears from 1955 until 1983. In 1984, they adopted the Zephyrs nickname, which they kept when they moved to New Orleans in 1993 as the Major League Colorado Rockies set up shop in the Mile High City.
West Coast Negro Baseball Association (1946)
April 8, 2025
Formed: October 18, 1945 Disbanded: July 23, 1946 First Game: May 12, 1946 (Oakland Larks 8 vs. San Diego Tigers 7 @ Fresno) Final
Negro National League II (1933-1948)
March 27, 2025
Formed: January, 1933 (as the National Association of Baseball Clubs) Disbanded: December 8, 1948 First Game: April 29 (Chicago American Giants @ Indianapolis ABCs) Final
Negro Southern League (1932)
March 27, 2025
Formed: March, 1920 (1932, only major league season) Disbanded: 1936 First Games: April 29, 1920 Final Games: July, 1936 Seasons: 17 (1 major league) States: