19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| The Dalles | 1 | 15,859 | 16,029 | -0.16% | 2,372 | 7 | City |
| The Dalles | 2 | 15,859 | 15,981 | -0.16% | 2,372 | 7 | City |
| Chenoweth | 3 | 1,682 | 1,703 | -0.71% | 299 | 6 | CDP |
| Dufur | 4 | 636 | 639 | -0.16% | 1,080 | 1 | City |
| Dufur | 5 | 636 | 638 | -0.16% | 1,080 | 1 | City |
| Pine Hollow | 6 | 478 | 404 | -0.21% | 215 | 2 | CDP |
| Mosier | 7 | 466 | 464 | 0% | 1,022 | 0 | City |
| Mosier | 8 | 466 | 463 | 0% | 1,022 | 0 | City |
| Maupin | 9 | 420 | 423 | -0.24% | 301 | 1 | City |
| Maupin | 10 | 420 | 422 | -0.24% | 301 | 1 | City |
| Rowena | 11 | 104 | 203 | -5.45% | 58 | 2 | CDP |
| Sportsmans Park | 12 | 84 | 64 | 7.69% | 571 | 0 | CDP |
| Pine Grove | 13 | 78 | 86 | -6.02% | 13 | 6 | CDP |
| Wamic | 14 | 65 | 42 | 6.56% | 54 | 1 | CDP |
| Antelope | 15 | 38 | 37 | 0% | 82 | 0 | City |
| Antelope | 16 | 38 | 37 | 0% | 82 | 0 | City |
| Shaniko | 17 | 32 | 34 | -3.03% | 64 | 0 | City |
| Shaniko | 18 | 32 | 34 | -3.03% | 64 | 0 | City |
| Tygh Valley | 19 | 16 | 123 | -44.83% | 4 | 4 | CDP |
The Dalles is the largest city in Wasco County, with a population of 15,859.
Tygh Valley is the smallest city in Wasco County, with a population of 16.
There are 19 cities in Wasco County, Oregon.