4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wasco | 1 | 450 | 417 | 1.58% | 446 | 1.01 | City |
| Moro | 2 | 388 | 367 | 1.04% | 782 | 0.50 | City |
| Rufus | 3 | 285 | 264 | 1.42% | 241 | 1.18 | City |
| Grass Valley | 4 | 167 | 152 | 1.83% | 327 | 0.51 | City |
Wasco is the largest city in Sherman County, with a population of 450.
Grass Valley is the smallest city in Sherman County.
There are 4 cities in Sherman County, Oregon.