Both the Seattle Seahawks and Tampa Bay Buccaneers joined the NFL in 1976.
Seattle joined the AFC and Tampa Bay joined the NFC.
Due to divisional realignment Seattle is now an NFC team.
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Click on the 'Chronology of NFL Teams' link on this page to see when every team that has participated in the NFL joined and when those that folded left.
The Vikings joined the NFL as an expansion team in 1961.
There were 28 teams from 1976 (when the Seahawks and Bucs joined) until 1995 (when Carolina and Jacksonville joined).
The Chicago Bears, who were founded in 1919 and joined the NFL in 1920. The only remaining team from the NFL's first season in 1920 are the Cardinals (the oldest team; founded in 1898)
The Philadelphia Eagles team was founded in 1933 and joined the NFL the same year.