1999 PDL season
The 1999 USL Premier Development League season was the 5th PDL season. The season began in April 1999 and ended in August 1999.
Chicago Sockers finished the season as national champions, beating Spokane Shadow 3-1 in the PDL Championship game. Jackson Chargers had finished with the best regular season record in the league, winning 14 out of their 16 games, suffering just two losses, and finishing with a +55 goal difference.
Changes from 1998 season
Name changes
- Abbotsford Athletes In Action changed their name to the Abbotsford 86ers Select.
- Central Florida Lionhearts changed their name to the Central Florida Kraze.
- Fox River Rebels changed their name to the Wisconsin Rebels.
- Grand Rapids Explosion changed their name to West Michigan Explosion.
- Seattle Hibernians changed their name to Seattle Sounders Select.
New teams
| Team | Area | Location | Previous affiliation |
 Brooklyn Knights | Brooklyn area | Brooklyn, NY | expansion |
| Capital District Shockers | New York Capital District area | Albany, NY | from D-3 Pro League |
 Central Jersey Riptide | Central Jersey area | Trenton, NJ | from D-3 Pro League |
 Chicago Sockers | Chicago area | Chicago, IL | from D-3 Pro League |
 Clarksville Gunners | Clarksville area | Clarksville, TN | expansion |
 Lexington Bluegrass Bandits | Lexington area | Lexington, KY | returned from hiatus |
 Miami Breakers | Miami area | Miami, FL | from D-3 Pro League |
 Nevada Zephyrs | Las Vegas area | Las Vegas, NV | expansion |
| New York Freedom | New York City area | New York, NY | expansion |
| Orlando Nighthawks | Central Florida area | Orlando, FL | from D-3 Pro League |
| Rockford Raptors | Rockford area | Rockford, IL | from D-3 Pro League |
 San Fernando Valley Heroes | Los Angeles area | Los Angeles, CA | from D-3 Pro League |
 Team St. Louis | St. Louis area | St. Louis, MO | expansion |
 Tucson Amigos | Tucson area | Tucson, AZ | returned from hiatus |
 Vermont Voltage | Vermont area | St. Albans, VT | from D-3 Pro League |
| Westchester Flames | Suburban Mainland New York area | New Rochelle, NY | expansion |
 Wichita Blue | Wichita area | Wichita, KS | returned from hiatus |
 Willamette Valley Firebirds | Portland area | Portland, OR | returned from hiatus |
Teams leaving
5 teams folded after the 1998 Season:- Detroit Dynamite
- Lansing Locomotive
- Northern Arizona Prospectors
- Seattle BigFoot
- Southern California Chivas
Okanagan Valley Challenge and Victoria Umbro Select returned to the PCSL, ending their associate membership. Abbotsford Athletes In Action and Seattle Hibernian retained their membership.