Other concurrent baseball leagues:    
FL  ·  USBL  ·  Negro
F i l t e r   &   S o r t 
Los Angeles Angels Logo
a.k.a. of Anaheim
1961-2020 60 1
Joined the American League as an expansion team to begin the 1961 season. Left Los Angeles and relocated to Anaheim to begin the 1966 season.
Arizona Diamondbacks Logo
1998-2020 23 1
Joined the National League as an expansion team to begin the 1998 season.
Atlanta Braves Logo
1966-2020 55 1
Left the National Association to become one of 8 founding clubs of the NL in 1876. Left Boston and relocated to Milwaukee in 1953. Left Milwaukee to become the Atlanta Braves in 1966.
Baltimore Orioles Logo
1954-2020 67 3
Began as Milwaukee Brewers in 1894 and were one of the original AL franchises in 1901. Became St. Louis Browns in 1902 and relocated to Baltimore to become Orioles in 1954.
Boston Americans Logo
a.k.a. Red Sox
1901-2020 120 9
One of the eight original American League teams beginning with the 1901 season.
Chicago Orphans Logo
a.k.a. Cubs
1901-2020 120 3
Left the National Association to become one of 8 founding clubs of the National League in 1876.
Chicago White Sox Logo
1901-2020 120 4
One of the eight original American League teams beginning with the 1901 season.
Cincinnati Reds Logo
a.k.a. Redlegs
1901-2020 120 5
Left the American Association to join the National League to begin the 1890 season. Franchise currently exists as the Cincinnati Reds.
Cleveland Bluebirds Logo
a.k.a. Bronchos, Indians, Naps
1901-2020 120 2
One of the eight original American League teams beginning with the 1901 season.
Colorado Rockies Logo
1993-2020 28
Joined the National League as an expansion team to begin the 1993 season.
Detroit Tigers Logo
1901-2020 120 4
One of the eight original American League teams beginning with the 1901 season.
Florida Marlins Logo
1993-2020 28 2
Joined the National League as an expansion team to begin the 1993 season.
Houston Colt .45's Logo
a.k.a. Astros
1962-2020 59 1
Joined the National League as an expansion team to begin the 1962 season. Moved to the American League in 2013 in order to faciliate MLB divisional realignment.
Kansas City Royals Logo
1969-2020 52 2
Joined the American League as an expansion team to begin the 1969 season.
Los Angeles Dodgers Logo
1958-2020 63 6
Left the American Association to join the National League to begin the 1890 season. Left Brooklyn and relocated to become the Los Angeles Dodgers in 1957.
Milwaukee Brewers Logo
1970-2020 51
Joined the American League as an expansion team to begin the 1969 season. Left Seattle and relocated to Milwaukee to begin the 1970 season. Moved to the National League in 1998 in order to faciliate MLB divisional realignment.
Minnesota Twins Logo
1961-2020 60 2
One of the eight original American League teams beginning with the 1901 season. Left Washington DC to relocate to Minnesota to begin the 1961 season.
Washington Nationals Logo
2005-2020 16 1
Joined the National League as an expansion team to begin the 1969 season. Left Montreal and relocated to Washington DC to begin the 2005 season.
New York Mets Logo
1962-2020 59 2
Joined the National League as an expansion team to begin the 1962 season.
New York Highlanders Logo
a.k.a. Yankees
1903-2020 118 27
One of the eight original American League teams beginning with the 1901 season. Left Baltimore and relocated to New York to begin the 1903 season.
Oakland Athletics Logo
1968-2020 53 4
One of the eight original American League teams beginning with the 1901 season. Left Philadelphia to relocate in Kansas City to begin the 1955 season. Left Kansas City to relocate to Oakland to begin the 1968 season.
Philadelphia Phillies Logo
a.k.a. Blue Jays
1901-2020 120 2
Entered the National League in 1883. Franchise currently exists as the Philadelphia Phillies.
Pittsburg Pirates Logo
1901-2020 120 7
Left the American Association to join the National League to begin the 1887 season. Franchise currently exists as the Pittsburgh Pirates.
San Diego Padres Logo
1969-2020 52
Joined the National League as an expansion team to begin the 1969 season.
Seattle Mariners Logo
1977-2020 44
Joined the American League as an expansion team to begin the 1977 season.
San Francisco Giants Logo
1958-2020 63 3
Entered the National League in 1883. Left New York and relocated to San Francisco to begin the 1958 season.
St. Louis Cardinals Logo
1901-2020 120 11
After the American Association folded, they joined the National League in 1892. Franchise currently exists as the St. Louis Cardinals.
Tampa Bay Devil Rays Logo
a.k.a. Rays
1998-2020 23
Joined the American League as an expansion team to begin the 1998 season.
Texas Rangers Logo
1972-2020 49
Joined the American League as an expansion team to begin the 1961 season. Left Washington DC and relocated to Arlington in 1972.
Toronto Blue Jays Logo
1977-2020 44 2
Joined the American League as an expansion team to begin the 1977 season.
Montreal Expos Logo
1969-2004 36
Joined the National League as an expansion team to begin the 1969 season. Left Montreal and relocated to Washington DC to begin the 2005 season.
Washington Senators Logo
1961-1971 11
Joined the American League as an expansion team to begin the 1961 season. Left Washington DC and relocated to Arlington in 1972.
Seattle Pilots Logo
1969-1969 1
Joined the American League as an expansion team to begin the 1969 season. Left Seattle and relocated to Milwaukee to begin the 1970 season. Moved to the National League in 1998 in order to faciliate MLB divisional realignment.
Kansas City Athletics Logo
1955-1967 13
One of the eight original American League teams beginning with the 1901 season. Left Philadelphia to relocate in Kansas City to begin the 1955 season. Left Kansas City to relocate to Oakland to begin the 1968 season.
Milwaukee Braves Logo
1953-1965 13 1
Left the National Association to become one of 8 founding clubs of the NL in 1876. Left Boston and relocated to Milwaukee in 1953. Left Milwaukee to become the Atlanta Braves in 1966.
Washington Senators Logo
1901-1960 60 1
One of the eight original American League teams beginning with the 1901 season. Left Washington DC to relocate to Minnesota to begin the 1961 season.
Brooklyn Superbas Logo
a.k.a. Dodgers, Robins, Trolley Dodgers
1901-1957 57 1
Left the American Association to join the National League to begin the 1890 season. Left Brooklyn and relocated to become the Los Angeles Dodgers in 1957.
New York Giants Logo
1901-1957 57 5
Entered the National League in 1883. Left New York and relocated to San Francisco to begin the 1958 season.
Philadelphia Athletics Logo
1901-1954 54 6
One of the eight original American League teams beginning with the 1901 season. Left Philadelphia to relocate in Kansas City to begin the 1955 season. Left Kansas City to relocate to Oakland to begin the 1968 season.
St. Louis Browns Logo
1902-1953 52
Began as Milwaukee Brewers in 1894 and were one of the original AL franchises in 1901. Became St. Louis Browns in 1902 and relocated to Baltimore to become Orioles in 1954.
Boston Beaneaters Logo
a.k.a. Bees, Braves, Doves, Rustlers
1901-1952 52 1
Left the National Association to become one of 8 founding clubs of the NL in 1876. Left Boston and relocated to Milwaukee in 1953. Left Milwaukee to become the Atlanta Braves in 1966.
Baltimore Orioles Logo
1901-1902 2
One of the eight original American League teams beginning with the 1901 season. Left Baltimore and relocated to New York to begin the 1903 season.
Milwaukee Brewers Logo
1901-1901 1
Began as Milwaukee Brewers in 1894 and were one of the original AL franchises in 1901. Became St. Louis Browns in 1902 and relocated to Baltimore to become Orioles in 1954.

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