9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Walla Walla | 1 | 32,774 | 34,186 | -0.85% | 2,334 | 14.04 | City |
| College Place | 2 | 9,649 | 9,931 | -0.58% | 3,084 | 3.13 | City |
| Burbank | 3 | 3,406 | 3,522 | 0.24% | 437 | 7.79 | CDP |
| Garrett | 4 | 1,986 | 1,815 | 1.9% | 763 | 2.60 | CDP |
| Waitsburg | 5 | 1,176 | 1,170 | 0.08% | 1,011 | 1.16 | City |
| Touchet | 6 | 501 | 357 | 1.01% | 412 | 1.22 | CDP |
| Prescott | 7 | 367 | 372 | -0.27% | 920 | 0.40 | City |
| Dixie | 8 | 146 | 170 | -2.01% | 341 | 0.43 | CDP |
| Wallula | 9 | 65 | 151 | -10.96% | 619 | 0.10 | CDP |
Walla Walla is the largest city in Walla Walla County, with a population of 32,774.
Wallula is the smallest city in Walla Walla County.
There are 9 cities in Walla Walla County, Washington.