24 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kingsbury | 1 | 12,827 | 12,943 | -0.12% | 323 | 40 | Town |
| Hudson Falls | 2 | 7,330 | 7,416 | -0.19% | 3,939 | 2 | Village |
| Granville | 3 | 6,180 | 6,201 | 0.05% | 111 | 56 | Town |
| Fort Edward | 4 | 5,986 | 5,960 | 0.34% | 225 | 27 | Town |
| Greenwich | 5 | 4,850 | 4,858 | 0.1% | 111 | 44 | Town |
| Fort Ann | 6 | 4,278 | 5,739 | -5.17% | 39 | 109 | Town |
| Whitehall | 7 | 4,017 | 4,014 | 0.2% | 70 | 57 | Town |
| Argyle | 8 | 3,633 | 3,645 | 0.03% | 64 | 57 | Town |
| White Creek | 9 | 3,271 | 3,272 | 0.15% | 68 | 48 | Town |
| Fort Edward | 10 | 3,125 | 3,163 | -0.19% | 1,774 | 2 | Village |
| Salem | 11 | 2,606 | 2,609 | 0.12% | 50 | 52 | Town |
| Whitehall | 12 | 2,477 | 2,492 | -0.08% | 439 | 6 | Village |
| Granville | 13 | 2,416 | 2,428 | -0.08% | 1,560 | 2 | Village |
| Easton | 14 | 2,258 | 2,274 | 0.04% | 36 | 62 | Town |
| Hartford | 15 | 2,180 | 2,185 | 0.18% | 50 | 43 | Town |
| Cambridge | 16 | 1,915 | 1,946 | -0.1% | 53 | 36 | Town |
| Cambridge | 17 | 1,798 | 1,806 | -0.06% | 1,042 | 2 | Village |
| Hebron | 18 | 1,781 | 1,784 | 0.17% | 32 | 56 | Town |
| Jackson | 19 | 1,711 | 1,714 | 0.12% | 46 | 37 | Town |
| Greenwich | 20 | 1,665 | 1,676 | -0.12% | 1,133 | 1 | Village |
| Hampton | 21 | 859 | 858 | 0.12% | 39 | 22 | Town |
| Putnam | 22 | 562 | 564 | 0% | 17 | 33 | Town |
| Fort Ann | 23 | 471 | 473 | 0% | 1,647 | 0 | Village |
| Argyle | 24 | 291 | 293 | 0% | 918 | 0 | Village |
Kingsbury is the largest city in Washington County, with a population of 12,827.
Argyle is the smallest city in Washington County, with a population of 291.
There are 24 cities in Washington County, New York.