13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Blair | 1 | 8,042 | 7,824 | 0.54% | 1,459 | 6 | City |
| Township 1 | 2 | 4,511 | 4,433 | 0.51% | 83 | 54 | Township |
| Township 2 | 3 | 3,216 | 3,162 | 0.25% | 80 | 40 | Township |
| Township 7 | 4 | 2,760 | 2,718 | 0.44% | 45 | 61 | Township |
| Township 6 | 5 | 1,595 | 1,572 | 0.44% | 14 | 114 | Township |
| Arlington | 6 | 1,323 | 1,305 | 0.23% | 2,212 | 1 | Village |
| Township 5 | 7 | 1,227 | 1,217 | 0.33% | 11 | 115 | Township |
| Fort Calhoun | 8 | 1,104 | 1,091 | 0.18% | 1,616 | 1 | City |
| Kennard | 9 | 370 | 382 | -0.8% | 1,341 | 0 | Village |
| Herman | 10 | 231 | 236 | -0.43% | 1,615 | 0 | Village |
| Washington | 11 | 133 | 130 | 0% | 636 | 0 | Village |
| Washington | 12 | 95 | 96 | 0% | 1 | 72 | Township |
| Washington | 13 | 65 | 66 | -1.52% | 1 | 48 | Township |
Blair is the largest city in Washington County, with a population of 8,042.
Washington is the smallest city in Washington County, with a population of 65.
There are 13 cities in Washington County, Nebraska.