1. Saint Louis FC (6 pro seasons)
2. Philadelphia Union II (5 pro seasons)
3. Portland Timbers 2 (6 pro seasons)
4. Reno 1868 (4 pro seasons)
5. North Carolina FC (14 pro seasons)
Note: USL Championship had 35 teams in 2020. Oakland Roots’ move from NISA gives it 31 teams for 2021.

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