18 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Baltimore | 1 | 12,649 | 11,017 | 2.45% | 1,053 | 12 | CDP |
| Warrenton | 2 | 10,268 | 10,057 | 0.43% | 2,344 | 4 | Town |
| Warrenton | 3 | 10,268 | 10,048 | 0.43% | 2,344 | 4 | Town |
| Bealeton | 4 | 4,729 | 3,964 | 0.42% | 858 | 6 | CDP |
| Marshall | 5 | 3,421 | 2,913 | 3.92% | 1,186 | 3 | CDP |
| Southern Gateway | 6 | 2,488 | 3,291 | -0.84% | 774 | 3 | CDP |
| Apple Mountain Lake | 7 | 1,631 | 1,345 | 0.99% | 950 | 2 | CDP |
| Bull Run Mountain Estates | 8 | 1,593 | 1,777 | 1.4% | 905 | 2 | CDP |
| Skyland Estates | 9 | 781 | 941 | -0.38% | 326 | 2 | CDP |
| Remington | 10 | 649 | 616 | 0.93% | 2,963 | 0 | Town |
| Remington | 11 | 649 | 618 | 0.93% | 2,963 | 0 | Town |
| The Plains | 12 | 257 | 247 | 0.78% | 931 | 0 | Town |
| The Plains | 13 | 257 | 247 | 0.78% | 931 | 0 | Town |
| Catlett | 14 | 163 | 54 | -5.23% | 51 | 3 | CDP |
| Midland | 15 | 154 | 94 | -2.53% | 38 | 4 | CDP |
| Rectortown | 16 | 74 | 59 | 7.25% | 116 | 1 | CDP |
| Upperville | 17 | 69 | 129 | 7.81% | 162 | 0 | CDP |
| Calverton | 18 | 8 | 72 | -65.22% | 2 | 5 | CDP |
New Baltimore is the largest city in Fauquier County, with a population of 12,649.
Calverton is the smallest city in Fauquier County, with a population of 8.
There are 18 cities in Fauquier County, Virginia.