Seattle Mariners Logo
Seattle Mariners
MLB: 1977-2018 (42 seasons)
Joined the American League as an expansion team to begin the 1977 season.
Seattle Seahawks Logo
Seattle Seahawks
NFL: 1976-2018 (43 seasons)

Defunct Teams

2 teams have folded or moved away from the Seattle area
Seattle SuperSonics Logo
Seattle SuperSonics
NBA: 1968-2008 (41 seasons)
Seattle Pilots Logo
Seattle Pilots
MLB: 1969-1969 (1 season)
Joined the American League as an expansion team to begin the 1969 season. Left Seattle and relocated to Milwaukee to begin the 1970 season. Moved to the National League in 1998 in order to faciliate MLB divisional realignment.

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