This day in baseball · September 16, 1871: the New York Mutuals visited the Boston Red Stockings at South End Grounds I. Boston Red Stockings 9, New York Mutuals 7. W1871 in baseball↗

From the vault · October 15, 2008 · 2008 NLCS, Game 5: The Philadelphia Phillies beat the Los Angeles Dodgers 5–1 at Dodger Stadium to win the NL pennant, 4 games to 1. ▶ Video ↗

Leagues

Every league with seasons on record. “Teams” counts every club that ever played in the league; “now” is this season’s membership. Click a league for its seasons, pennant winners and members.

Major leagues

League	Code	Years	Seasons	Teams	Now	Attendance (all time)
National League	NL	1876–present	151	45	15	2,133,472,506
American League	AL	1901–present	126	27	15	1,935,714,012
American Association	AA	1882–1891	10	26	—
Union Association	UA	1884	1	12	—
Players League	PL	1890	1	8	—
Federal League	FL	1914–1915	2	9	—

Negro major leagues

League	Code	Years	Seasons	Teams	Now
Negro National League (I)	NNL	1920–1931	12	26	—
Eastern Colored League	ECL	1923–1928	6	11	—
American Negro League	ANL	1929	1	6	—
East-West League	EWL	1932	1	8	—
Negro Southern League	NSL	1932	1	11	—
Negro National League (II)	NN2	1933–1948	16	23	—
Negro American League	NAL	1937–1948	12	22	—

Others

League	Code	Years	Seasons	Teams	Now
National Association	NA	1871–1875	5	26	—
Independent	IND	1891–1936	17	22	—
Western (Negro leagues)	WES	1902–1919	17	18	—
Eastern (Negro leagues)	EAS	1903–1928	16	13	—
Negro American/National combined	NAC	1907–1908	2	4	—
International	INT	1909	1	3	—

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Leagues

Major leagues

Negro major leagues

Others