| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Walla Walla | 1 | 33,968 | 34,274 | -0.26% | 2,419 | 14 | City |
| College Place | 2 | 9,895 | 9,958 | -0.28% | 2,790 | 4 | City |
| Waitsburg | 3 | 1,185 | 1,165 | 0.08% | 1,019 | 1 | City |
| Prescott | 4 | 367 | 374 | -0.54% | 920 | 0 | City |
Walla Walla is the largest city in Walla Walla County, with a population of 33,968.
Prescott is the smallest city in Walla Walla County, with a population of 367.
There are 4 cities in Walla Walla County, Washington.