5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fairfax | 1 | 27,420 | 24,179 | 2.01% | 4,394 | 6 | City |
| Herndon | 2 | 25,476 | 24,588 | 0.58% | 5,944 | 4 | Town |
| Vienna | 3 | 16,619 | 16,448 | 0.17% | 3,774 | 4 | Town |
| Falls Church | 4 | 15,212 | 14,677 | 0.59% | 7,435 | 2 | City |
| Clifton | 5 | 242 | 242 | 0% | 988 | 0 | Town |
Fairfax is the largest city in Fairfax County, with a population of 27,420.
Clifton is the smallest city in Fairfax County, with a population of 242.
There are 5 cities in Fairfax County, Virginia.