Clubs · 1966
8 clubs
| Club | League | Based in | Home ground |
|---|---|---|---|
| Baltimore Flyers | — | Baltimore | — |
| Boston Rovers | — | — | Manning Bowl |
| Chicago Spurs | National Professional Soccer League | Chicago | Soldier Field |
| New York Skyliners | — | New York City | Yankee Stadium |
| Oakland Clippers | National Professional Soccer League | Oakland | Oakland Coliseum |
| San Diego Toros | North American Soccer League | San Diego | Balboa Stadium |
| St. Louis Stars | National Professional Soccer League | St. Louis | Busch Memorial Stadium |