11 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Oakton | Fairfax County | 37,178 |
| Orange | Orange County | 5,288 |
| One Loudoun | Loudoun County | 3,607 |
| Oak Grove | Loudoun County | 2,556 |
| Onancock | Accomack County | 1,158 |
| Occoquan | Prince William County | 1,070 |
| Opal | Culpeper County | 798 |
| Onley | Accomack County | 537 |
| Oak Level | Franklin County | 524 |
| Osaka | Wise County | 99 |
| Oak Hall | Accomack County | 37 |