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The Buffalo Bills are a professional American football team based in the Buffalo, New York, metropolitan area, playing their home games in the suburb of Orchard Park. They are currently members of the Eastern Division of the American Football Conference (AFC) in the National Football League (NFL). The Bills began competitive play in 1960 as a charter member of the American Football League and joined the NFL as part of the AFL-NFL Merger.

The Bills won two consecutive AFL titles in 1964 and 1965, but the club has not won a championship since the merger. Buffalo is also the first and only team to win four consecutive American Football Conference Championships, though they failed to win any of the subsequent Super Bowls.

The Bills are named after Buffalo Bill Cody, the winning entry in a local contest. The Bills' cheerleaders are known as the Buffalo Jills. The official mascot is Billy Buffalo.

The Bills conduct summer training camp at Saint John Fisher College in Pittsford, NY.

They are currently the only NFL team to play their home games within New York State. Both the New York Jets and the New York Giants play in the suburb of East Rutherford, New Jersey outside of New York City.