| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Barre | 1 | 8,168 | 8,469 | -0.56% | 2,049 | 4 | City |
| Barre | 2 | 7,983 | 7,928 | -0.22% | 261 | 31 | Town |
| Montpelier | 3 | 7,781 | 8,059 | -0.54% | 774 | 10 | City |
| Northfield | 4 | 5,849 | 5,898 | -0.41% | 131 | 45 | Town |
| Waterbury | 5 | 5,430 | 5,329 | -0.07% | 113 | 48 | Town |
| Berlin | 6 | 2,995 | 2,866 | 1.59% | 83 | 36 | Town |
| East Montpelier | 7 | 2,583 | 2,600 | -0.42% | 81 | 32 | Town |
| Warren | 8 | 1,956 | 1,975 | -0.46% | 49 | 40 | Town |
| Waitsfield | 9 | 1,892 | 1,840 | 0.26% | 73 | 26 | Town |
| Middlesex | 10 | 1,868 | 1,782 | 1.41% | 47 | 39 | Town |
| Moretown | 11 | 1,754 | 1,756 | -0.17% | 44 | 40 | Town |
| Calais | 12 | 1,661 | 1,661 | 0% | 44 | 38 | Town |
| Marshfield | 13 | 1,576 | 1,578 | 0.57% | 36 | 43 | Town |
| Cabot | 14 | 1,464 | 1,442 | -0.41% | 39 | 37 | Town |
| Duxbury | 15 | 1,452 | 1,406 | 0.55% | 34 | 43 | Town |
| Fayston | 16 | 1,396 | 1,367 | -0.29% | 38 | 37 | Town |
| Plainfield | 17 | 1,192 | 1,235 | -2.13% | 57 | 21 | Town |
| Worcester | 18 | 942 | 965 | -0.95% | 24 | 39 | Town |
| Woodbury | 19 | 928 | 928 | -0.11% | 25 | 38 | Town |
| Marshfield | 20 | 266 | 268 | -0.37% | 1,031 | 0 | Village |
Barre is the largest city in Washington County, with a population of 8,168.
Marshfield is the smallest city in Washington County, with a population of 266.
There are 20 cities in Washington County, Vermont.