9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| West Bend | 1 | 32,351 | 31,745 | 0.31% | 2,077 | 16 | City |
| Germantown | 2 | 21,091 | 20,913 | 0.14% | 613 | 34 | Village |
| Hartford | 3 | 16,143 | 15,665 | 0.5% | 1,803 | 9 | City |
| Richfield | 4 | 11,798 | 11,752 | 0.07% | 328 | 36 | Village |
| Jackson | 5 | 8,322 | 7,863 | 0.93% | 2,154 | 4 | Village |
| Slinger | 6 | 6,640 | 6,049 | 1.51% | 1,209 | 5 | Village |
| Kewaskum | 7 | 4,689 | 4,314 | 1.36% | 1,992 | 2 | Village |
| Newburg | 8 | 1,123 | 1,146 | -0.35% | 1,167 | 1 | Village |
| Chenequa | 9 | 538 | 526 | 0.37% | 155 | 3 | Village |
West Bend is the largest city in Washington County, with a population of 32,351.
Chenequa is the smallest city in Washington County, with a population of 538.
There are 9 cities in Washington County, Wisconsin.