Earlier today the USL Championship finalized the division alignments for the 2021 season and the 31-team grouping, and Loudoun United found themselves in the 8-team Atlantic Division of the following teams:
- Charleston Battery
- Charlotte Independence
- Hartford Athletic
- Miami FC
- New York Red Bulls II
- Pittsburgh Riverhounds SC
- Tampa Bay Rowdies
Loudoun played Hartford, New York and Pittsburgh as part of their 2020 season. The fifth team, Philadelphia Union II, withdrew from the Championship in 2020. Loudoun played Charleston, Charlotte and Tampa Bay in 2019, and played the Ottawa Fury as well, however, the Fury transferred their franchise rights to Miami after the 2019 season.