Other concurrent baseball leagues:    
FL  ·  USBL  ·  Negro
F i l t e r   &   S o r t 
a.k.a. of Anaheim
1961-2021 61 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.
1998-2021 24 1
Joined the National League as an expansion team to begin the 1998 season.
1966-2021 56 2
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.
1954-2021 68 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.
a.k.a. Red Sox
1901-2021 121 9
One of the eight original American League teams beginning with the 1901 season.
a.k.a. Cubs
1901-2021 121 3
Left the National Association to become one of 8 founding clubs of the National League in 1876.
1901-2021 121 4
One of the eight original American League teams beginning with the 1901 season.
a.k.a. Redlegs
1901-2021 121 5
Left the American Association to join the National League to begin the 1890 season. Franchise currently exists as the Cincinnati Reds.
a.k.a. Bronchos, Indians, Naps
1901-2021 121 2
One of the eight original American League teams beginning with the 1901 season.
1993-2021 29
Joined the National League as an expansion team to begin the 1993 season.
1901-2021 121 4
One of the eight original American League teams beginning with the 1901 season.
1993-2021 29 2
Joined the National League as an expansion team to begin the 1993 season.
a.k.a. Astros
1962-2021 60 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.
1969-2021 53 2
Joined the American League as an expansion team to begin the 1969 season.
1958-2021 64 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.
1970-2021 52
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.
1961-2021 61 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.
2005-2021 17 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.
1962-2021 60 2
Joined the National League as an expansion team to begin the 1962 season.
a.k.a. Yankees
1903-2021 119 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.
1968-2021 54 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.
a.k.a. Blue Jays
1901-2021 121 2
Entered the National League in 1883. Franchise currently exists as the Philadelphia Phillies.
1901-2021 121 7
Left the American Association to join the National League to begin the 1887 season. Franchise currently exists as the Pittsburgh Pirates.
1969-2021 53
Joined the National League as an expansion team to begin the 1969 season.
1977-2021 45
Joined the American League as an expansion team to begin the 1977 season.
1958-2021 64 3
Entered the National League in 1883. Left New York and relocated to San Francisco to begin the 1958 season.
1901-2021 121 11
After the American Association folded, they joined the National League in 1892. Franchise currently exists as the St. Louis Cardinals.
a.k.a. Rays
1998-2021 24
Joined the American League as an expansion team to begin the 1998 season.
1972-2021 50
Joined the American League as an expansion team to begin the 1961 season. Left Washington DC and relocated to Arlington in 1972.
1977-2021 45 2
Joined the American League as an expansion team to begin the 1977 season.
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.
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.
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.
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.
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.
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.
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.
1901-1957 57 5
Entered the National League in 1883. Left New York and relocated to San Francisco to begin the 1958 season.
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.
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.
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.
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.
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.

1 Comment

  1. I sincerely appreciate the research work, and the information being shared. It is important and interesting history.

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