19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| West Bend | 1 | 32,250 | 31,746 | 0.31% | 2,071 | 16 | City |
| West Bend | 2 | 32,250 | 31,745 | 0.31% | 2,071 | 16 | City |
| Germantown | 3 | 21,061 | 20,914 | 0.14% | 613 | 34 | Village |
| Germantown | 4 | 21,061 | 20,913 | 0.14% | 613 | 34 | Village |
| Hartford | 5 | 16,063 | 15,655 | 0.49% | 1,794 | 9 | City |
| Hartford | 6 | 16,063 | 15,665 | 0.49% | 1,794 | 9 | City |
| Richfield | 7 | 11,790 | 11,742 | 0.06% | 328 | 36 | Village |
| Richfield | 8 | 11,790 | 11,752 | 0.06% | 328 | 36 | Village |
| Jackson | 9 | 8,245 | 7,869 | 0.93% | 2,134 | 4 | Village |
| Jackson | 10 | 8,245 | 7,863 | 0.93% | 2,134 | 4 | Village |
| Slinger | 11 | 6,541 | 6,013 | 1.52% | 1,191 | 5 | Village |
| Slinger | 12 | 6,541 | 6,049 | 1.52% | 1,191 | 5 | Village |
| Kewaskum | 13 | 4,626 | 4,310 | 1.36% | 1,965 | 2 | Village |
| Kewaskum | 14 | 4,626 | 4,314 | 1.36% | 1,965 | 2 | Village |
| Newburg | 15 | 1,127 | 1,147 | -0.35% | 1,172 | 1 | Village |
| Newburg | 16 | 1,127 | 1,146 | -0.35% | 1,172 | 1 | Village |
| Allenton | 17 | 838 | 759 | 0.12% | 537 | 2 | CDP |
| Chenequa | 18 | 536 | 526 | 0.37% | 155 | 3 | Village |
| Chenequa | 19 | 536 | 526 | 0.37% | 155 | 3 | Village |
West Bend is the largest city in Washington County, with a population of 32,250.
Chenequa is the smallest city in Washington County, with a population of 536.
There are 19 cities in Washington County, Wisconsin.