The following are tentative team affiliations between MLS clubs and teams in the A-League (Division II) and USISL D3 Pro League (Division III) for 1998:
Chicago Fire
A-League Affiliates: Milwaukee Rampage, Minnesota Thunder.
D3 Pro Affiliates: Chicago Stingers, Indiana Blast, Rockford Raptors.
Colorado Rapids
A-League Affiliates: El Paso Patriots, Seattle Sounders.
D3 Pro Affiliates: Arizona Sahuaros, Tulsa Roughnecks.
Columbus Crew
A-League: Affiliates: Cincinnati Riverhawks, Rochester Raging Rhinos.
D3 Pro Affiliates: Cleveland Caps, Delaware Wizards, Reading Rage.
Dallas Burn
A-League Affiliates: Atlanta Ruckus, New Orleans Storm
D3 Pro Affiliates: Austin Lone Stars, Texas Toros, Houston Hurricanes, San Antonio Pumas.
D.C. United
A-League Affiliates: Hampton Roads Mariners, Richmond Kickers.
D3 Pro Affiliates: Charlotte Eagles, Northern Virginia Royals, Ocean City Sharks, Roanoke Wrath, Wilmington Hammerheads.
Kansas City Wizards
A-League Affiliates: Albuquerque Geckos, Hershey Wildcats.
D3 Pro Affiliates: Myrtle Beach SeaDawgs, South Carolina Shamrocks, Shreveport-Bossier Lions.
Los Angeles Galaxy
A-League Affiliates: Orange County Zodiac, San Diego Flash.
D3 Pro Affiliates: Los Angeles Fireballs, Valley Golden Eagles.
MetroStars
A-League Affiliates: Long Island Rough Riders, Staten Island Vipers.
D3 Pro Affiliates: New Jersey Stallions, N.Y. Capital District Alleycats, South Jersey Barons, Central Jersey Riptide.
Miami Fusion
A-League Affiliates: Jacksonville Cyclones, Raleigh Flyers.
D3 Pro Affiliates: Florida Strikers, Miami Breakers.
New England Revolution
A-League Affiliates: Connecticut Wolves, Worcester Wildfire.
D3 Pro Affiliates: Cape Cod Crusaders, New Hampshire Phantoms, Rhode Island Stingrays, Vermont Voltage, Western Mass. Pioneers.
San Jose Clash
A-League Affiliates: California Jaguars, San Francisco Bay Seals.
D3 Pro Affiliates: Chico Rooks, Reno Rattlers, Stanislaus County Cruisers.
Tampa Bay Mutiny
A-League Affiliates: Charleston Battery, Nashville Metros.
D3 Pro Affiliates: Orlando Nighthawks, Pensacola Barracudas, Southwest Florida Manatees, Tallahassee Tempest.
