5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Manassas Park | 1 | 16,472 | 17,164 | -0.84% | 5,429 | 3 | City |
| Dumfries | 2 | 6,042 | 5,719 | 1.07% | 3,936 | 2 | Town |
| Haymarket | 3 | 1,605 | 1,547 | 0.69% | 2,796 | 1 | Town |
| Occoquan | 4 | 1,070 | 1,035 | 0.66% | 6,185 | 0 | Town |
| Quantico | 5 | 594 | 579 | 0.51% | 8,486 | 0 | Town |
Manassas Park is the largest city in Prince William County, with a population of 16,472.
Quantico is the smallest city in Prince William County, with a population of 594.
There are 5 cities in Prince William County, Virginia.