9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Walla Walla | 1 | 33,807 | 34,275 | -0.28% | 2,408 | 14 | City |
| College Place | 2 | 9,815 | 9,969 | -0.31% | 3,137 | 3 | City |
| Burbank | 3 | 3,406 | 3,522 | 0.24% | 437 | 8 | CDP |
| Garrett | 4 | 1,986 | 1,815 | 1.9% | 763 | 3 | CDP |
| Waitsburg | 5 | 1,175 | 1,165 | 0.17% | 1,010 | 1 | City |
| Touchet | 6 | 501 | 357 | 1.01% | 412 | 1 | CDP |
| Prescott | 7 | 362 | 371 | -0.55% | 907 | 0 | City |
| Dixie | 8 | 146 | 170 | -2.01% | 341 | 0 | CDP |
| Wallula | 9 | 65 | 151 | -10.96% | 619 | 0 | CDP |
Walla Walla is the largest city in Walla Walla County, with a population of 33,807.
Wallula is the smallest city in Walla Walla County, with a population of 65.
There are 9 cities in Walla Walla County, Washington.