13 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Blair | 1 | 8,086 | 7,824 | 0.55% | 1,374 | 6 | City |
| Township 1 | 2 | 4,534 | 4,433 | 0.51% | 84 | 54 | Township |
| Township 2 | 3 | 3,224 | 3,162 | 0.25% | 81 | 40 | Township |
| Township 7 | 4 | 2,772 | 2,718 | 0.43% | 45 | 61 | Township |
| Township 6 | 5 | 1,602 | 1,572 | 0.44% | 14 | 114 | Township |
| Arlington | 6 | 1,327 | 1,305 | 0.3% | 2,219 | 1 | Village |
| Township 5 | 7 | 1,231 | 1,217 | 0.33% | 11 | 115 | Township |
| Fort Calhoun | 8 | 1,107 | 1,091 | 0.27% | 1,621 | 1 | City |
| Kennard | 9 | 368 | 382 | -0.54% | 1,333 | 0 | Village |
| Herman | 10 | 230 | 236 | -0.43% | 1,608 | 0 | Village |
| Washington | 11 | 134 | 130 | 0.75% | 641 | 0 | Village |
| Washington | 12 | 95 | 96 | 0% | 1 | 72 | Township |
| Washington | 13 | 64 | 66 | -1.54% | 1 | 48 | Township |
Blair is the largest city in Washington County, with a population of 8,086.
Washington is the smallest city in Washington County, with a population of 64.
There are 13 cities in Washington County, Nebraska.