| Club | Based in | Founded | Home ground |
|---|---|---|---|
| Atlanta Silverbacks | Atlanta | 1994 | Atlanta Silverbacks Park |
| Boston Bulldogs | Boston | 1996 | — |
| Colorado Foxes | — | 1990 | — |
| Columbus Xoggz | Columbus | 1993 | — |
| Connecticut Wolves | — | 1993 | — |
| El Paso Patriots | El Paso | 1989 | Patriot Stadium |
| Hershey Wildcats | — | 1997 | Hersheypark Stadium |
| Jacksonville Cyclones | — | 1995 | Mandarin High School |
| Lehigh Valley Steam | Lehigh Valley | 1999 | — |
| Long Island Rough Riders | Long Island | 1994 | Hofstra University Soccer Stadium |
| Maryland Mania | — | 1999 | — |
| Milwaukee Rampage | Milwaukee | 1993 | Uihlein Soccer Park |
| Minnesota Thunder | Blaine | 1990 | National Sports Center |
| Nashville Metros | Nashville | 1989 | E. S. Rose Park |
| New Orleans Storm | New Orleans | 1993 | Shrine on Airline |
| New York Centaurs | Randalls Island | 1994 | Downing Stadium |
| Portland Timbers | — | 2001 | Providence Park |
| Raleigh Express | Raleigh | 1993 | — |
| San Diego Flash | San Diego | 1998 | Mira Mesa Senior High School |
| San Francisco Seals | San Francisco | 1992 | Negoesco Stadium |
| Seattle Sounders | — | 1994 | Starfire Sports |
| Staten Island Vipers | Staten Island | 1998 | Tottenville High School |