The Green Bay Packers are a professional American football team based in Green Bay, Wisconsin. The Packers compete in the National Football League as a member club of the league's National Football Conference North division. It is the third-oldest franchise in the NFL, dating back to 1919, and is the only non-profit, community-owned major league professional sports team based in the United States. Home games have been played at Lambeau Field since 1957. The Packers are the last of the "small town teams" which were common in the NFL during the league's early days of the 1920s and '30s. Founded in 1919 by Earl "Curly" Lambeau and George Whitney Calhoun, the franchise traces its lineage to other semi-professional teams in Green Bay dating back to 1896. Between 1919 and 1920, the Packers competed against other semi-pro clubs from around Wisconsin and the Midwest, before joining the American Professional Football Association, the forerunner of today's NFL, in 1921. Although Green Bay is by far the smallest major league professional sports market in North America, Forbes ranked the Packers as the world's 26th most valuable sports franchise in 2016, with a value of $2.35 billion.