5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Manassas Park | 1 | 16,334 | 17,164 | -0.84% | 5,384 | 3 | City |
| Dumfries | 2 | 6,107 | 5,719 | 1.08% | 3,979 | 2 | Town |
| Haymarket | 3 | 1,617 | 1,547 | 0.75% | 2,817 | 1 | Town |
| Occoquan | 4 | 1,077 | 1,035 | 0.65% | 6,225 | 0 | Town |
| Quantico | 5 | 597 | 579 | 0.51% | 8,529 | 0 | Town |
Manassas Park is the largest city in Prince William County, with a population of 16,334.
Quantico is the smallest city in Prince William County, with a population of 597.
There are 5 cities in Prince William County, Virginia.