Seattle Mariners Logo
⚾ MLB: 1977-2020 44
Joined the American League as an expansion team to begin the 1977 season.
Seattle Seahawks Logo
🏈 NFL: 1976-2020 45 1

Defunct Teams

Teams that have folded or moved away from the Seattle area.
F i l t e r   &   S o r t 
Seattle Pilots Logo
⚾ MLB: 1969-1969 1
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.
The early history of sports contains hundreds of teams that appeared for only 1 or 2 seasons before folding. Most of these teams have no historical photographs or articles, so are omitted from this list to reduce clutter. To view a comprehensive list of all defunct teams, browse to the early leagues section for baseball, football, basketball, or hockey.

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