4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Walla Walla | 1 | 33,714 | 34,275 | -0.28% | 2,401 | 14 | City |
| College Place | 2 | 9,784 | 9,969 | -0.32% | 2,758 | 4 | City |
| Waitsburg | 3 | 1,177 | 1,165 | 0.17% | 1,012 | 1 | City |
| Prescott | 4 | 360 | 371 | -0.55% | 902 | 0 | City |
Walla Walla is the largest city in Walla Walla County, with a population of 33,714.
Prescott is the smallest city in Walla Walla County, with a population of 360.
There are 4 cities in Walla Walla County, Washington.