The NFL was founded in 1920 (originally called the American Professional Football Association), and had ten founding teams:
Racine Cardinals (now the Arizona Cardinals)
Decatur Staleys (now the Chicago Bears)
Akron Pros
Canton Bulldogs
Cleveland Tigers
Dayton Triangles
Hammond Pros
Muncie Flyers
Rochester Jeffersons
Rock Island Independents
Four more teams joined during the first year:
Buffalo All-Americans
Chicago Tigers
Columbus Panhandles
Detroit Heralds
Only the Cardinals and Bears franchises survived into the 1930s, but by then many other teams had joined the league, including the Green Bay Packers in 1921, the New York Giants in 1925, and the Portsmouth Spartans (now the Detroit Lions) in 1929.
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There were 14 teams in the inaugural 1920 NFL season. Many of them had played for years as independent clubs. Of the two teams that still remain from the 1920 season, the Cardinals are the oldest. They were founded in Chicago in 1898. (The other team that remains from the 1920 season is the Bears. The Packers joined the league a year later.)
Green Bay Packers, KC Chiefs, NY Jets, NY Giants, Buffalo Bills, Washington Redskins, Chicago Bears, SF 49ers, LA Rams, St. Louis Cardinals, Minnesota Vikings, SD Chargers,
Chicago Bears, Detroit Loins, New York Giants, Philadelphia Eagles, Cleveland Browns,
Green Bay Packers