Wikipedia cut and paste.
(Still not enough to make me a fan, but I knew there were reasons Wisconsin goes so ga-ga for the team, even when they're losing.)
The Green Bay Packers are an American football team based in Green Bay, Wisconsin. They are members of the North Division of the National Football Conference (NFC) in the National Football League (NFL). Green Bay is the third-oldest franchise in the NFL, organized and playing in 1919.[5] The Packers are the only non-profit, community-owned major league professional sports team in the United States.[6]
The Packers are the last vestige of "small town teams" common in the NFL during the 1920s and 1930s. Founded in 1919 by Earl "Curly" Lambeau (namesake of Lambeau Field on which the team plays) and George Whitney Calhoun, the Green Bay Packers trace their lineage to other semi-professional teams in Green Bay dating back to 1896. In 1919 and 1920 the Packers competed as a semi-professional football team against clubs from around Wisconsin and the Midwest. They joined the American Professional Football Association (APFA) in 1921, the forerunner to what is known today as the National Football League (NFL). Although Green Bay is by far the smallest professional sports market in North America, its local fan base and media extends into Milwaukee, 119 miles south (192 km); the team also played selected home games there between 1933 and 1994.
The Green Bay Packers have won 13 league championships (more than any other team in the NFL), including nine NFL championships prior to the Super Bowl era and four Super Bowl victories-in 1967 (Super Bowl I), 1968 (Super Bowl II), 1997 (Super Bowl XXXI) and 2011 (Super Bowl XLV).[7] The Packers are long-standing rivals with the Chicago Bears, Minnesota Vikings and Detroit Lions, who together comprise the NFL's NFC North division. The Bears-Packers rivalry is one of the oldest rivalries in NFL history, dating back to 1921.