Defunct NFL Franchises

Over the years, NFL teams have come and gone for one reason or another. About Football lists these defunct NFL franchises along with their years of existence.
Akron Pros - Akron Indians 1920-1926
Baltimore Colts 1950-1950
Boston Yanks - Bos/Bkn Yanks/Tigers 1944-1948
Brooklyn Dodgers - Brooklyn Tigers 1930-1944
Brooklyn Lions 1926-1926 3-8-0
Buffalo All-Americans - Buffalo Bisons - Buffalo Rangers 1920-1929
Canton Bulldogs 1920-1926
Chicago Tigers 1920-1920
Cincinnati Celts 1921-1921
Cincinnati Reds 1933-1934
Cleveland Indians - Cleveland Bulldogs 1923-1927
Cleveland Indians 1931-1931
Cleveland Tigers 1920-1921
Columbus Panhandles - Columbus Tigers 1920-1926
Dallas Texans 1952-1952
Dayton Triangles 1920-1929
Detroit Heralds 1920-1920
Detroit Panthers 1925-1926
Detroit Tigers 1921-1921
Detroit Wolverines 1928-1928
Duluth Kelleys - Duluth Eskimos 1923-1927
Evansville Crimson Giants 1921-1922
Frankford Yellow Jackets 1924-1931
Hammond Pros 1920-1926
Hartford Blues 1926-1926
Kansas City Blues - Kansas City Cowboys 1924-1926
Kenosha Maroons 1924-1924
Los Angeles Buccaneers 1926-1926
Louisville Brecks - Louisville Colonels 1921-1926
Milwaukee Badgers 1922-1926
Minneapolis Marines - Minneapolis Red Jackets 1921-1930
Muncie Flyers 1920-1921
New York Giants 1921-1921
New York Yankees 1927-1928
New York Yanks - New York Bulldogs 1949-1951
Oorang Indians 1922-1923
Orange Tornadoes - Newark Tornadoes 1929-1930
Pottsville Maroons - Boston Bulldogs 1925-1929
Providence Steam Roller 1925-1931
Racine Legend - Racine Tornadoes 1922-1926
Rochester Jeffersons 1920-1925
Rock Island Independents 1920-1925
St.

Louis All-Stars 1923-1923
St. Louis Gunners 1934-1934
Staten Island Stapletons 1929-1932
Toledo Maroons 1922-1923
Tonowanda Kardex 1921-1921
Washington Senators 1921-1921