I do not know them all but I know the Chi. bears, N.Y. giants, Cin. Bengals, Chi. cardinals, Phi. Eagles, Pit. steelers, and GB packers are what i can think of. There are two teams that played in the first season of the NFL (1920) that exist in 2008. They are the Decatur Staleys, now known as the Chicago Bears and the Chicago Cardinals, now known as the Arizona Cardinals. The Green Bay Packers entered the NFL in 1921.
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There are three: The Arizona Cardinals are the oldest, founded in 1898 as the Morgan Athletic Club in Chicago. The Chicago Bears (originally the Decatur Staleys of Decatur, IL) and Green Bay Packers (who have been the Green Bay Packers since their founding) were both formed in 1919, one year before the NFL, although for some reason the Bears consider the day the NFL was founded to be the day the team came into existence.
The National Football League started in 1920 and was known as the American Professional Football Association. The name was changed to National Football League in 1922.