| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Kingsbury | 1 | 12,827 | 12,938 | -0.02% | 323 | 40 | Town |
| Hudson Falls | 2 | 7,313 | 7,419 | -0.27% | 3,930 | 2 | Village |
| Granville | 3 | 6,202 | 6,209 | 0.13% | 112 | 56 | Town |
| Fort Edward | 4 | 5,950 | 5,958 | 0.12% | 224 | 27 | Town |
| Greenwich | 5 | 4,849 | 4,866 | 0.14% | 111 | 44 | Town |
| Whitehall | 6 | 4,004 | 4,012 | 0.13% | 70 | 57 | Town |
| Fort Ann | 7 | 3,722 | 5,750 | -12.36% | 34 | 109 | Town |
| Argyle | 8 | 3,651 | 3,652 | 0.16% | 65 | 57 | Town |
| White Creek | 9 | 3,281 | 3,282 | 0.21% | 68 | 48 | Town |
| Fort Edward | 10 | 3,119 | 3,164 | -0.29% | 1,770 | 2 | Village |
| Salem | 11 | 2,600 | 2,604 | 0.19% | 50 | 52 | Town |
| Whitehall | 12 | 2,474 | 2,492 | -0.2% | 439 | 6 | Village |
| Granville | 13 | 2,411 | 2,430 | -0.21% | 1,556 | 2 | Village |
| Easton | 14 | 2,261 | 2,280 | 0% | 36 | 62 | Town |
| Hartford | 15 | 2,181 | 2,182 | 0.23% | 50 | 43 | Town |
| Cambridge | 16 | 1,905 | 1,943 | -0.21% | 52 | 36 | Town |
| Cambridge | 17 | 1,813 | 1,816 | -0.11% | 1,050 | 2 | Village |
| Hebron | 18 | 1,778 | 1,784 | 0.11% | 32 | 56 | Town |
| Jackson | 19 | 1,705 | 1,705 | 0.24% | 46 | 37 | Town |
| Greenwich | 20 | 1,658 | 1,672 | -0.24% | 1,128 | 1 | Village |
| Hampton | 21 | 861 | 857 | 0.35% | 39 | 22 | Town |
| Putnam | 22 | 564 | 565 | 0.18% | 17 | 33 | Town |
| Fort Ann | 23 | 472 | 473 | -0.21% | 1,650 | 0 | Village |
| Argyle | 24 | 283 | 285 | -0.35% | 893 | 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 283.
There are 24 cities in Washington County, New York.