13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Blair | 1 | 8,067 | 7,816 | 0.62% | 1,464 | 5.51 | City |
| Township 1 | 2 | 4,448 | 4,443 | -0.2% | 82 | 54.08 | Township |
| Township 2 | 3 | 3,199 | 3,164 | 0.03% | 80 | 40.01 | Township |
| Township 7 | 4 | 2,718 | 2,710 | -0.11% | 44 | 61.16 | Township |
| Township 6 | 5 | 1,570 | 1,569 | -0.19% | 14 | 113.94 | Township |
| Arlington | 6 | 1,315 | 1,304 | 0.15% | 2,199 | 0.60 | Village |
| Township 5 | 7 | 1,214 | 1,225 | -0.33% | 11 | 115.23 | Township |
| Fort Calhoun | 8 | 1,101 | 1,095 | 0.09% | 1,612 | 0.68 | City |
| Kennard | 9 | 369 | 379 | -0.54% | 1,337 | 0.28 | Village |
| Herman | 10 | 243 | 250 | -0.41% | 1,699 | 0.14 | Village |
| Washington | 11 | 131 | 130 | 0% | 627 | 0.21 | Village |
| Washington township | 12 | 89 | 92 | -1.11% | 1 | 71.99 | Township |
| Washington township | 13 | 68 | 66 | 1.49% | 1 | 47.83 | Township |
Blair is the largest city in Washington County, with a population of 8,067.
Washington township is the smallest city in Washington County.
There are 13 cities in Washington County, Nebraska.