4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wasco | 1 | 461 | 416 | 1.77% | 457 | 1 | City |
| Moro | 2 | 403 | 369 | 1.51% | 813 | 0 | City |
| Rufus | 3 | 295 | 264 | 1.72% | 249 | 1 | City |
| Grass Valley | 4 | 172 | 153 | 1.78% | 337 | 1 | City |
Wasco is the largest city in Sherman County, with a population of 461.
Grass Valley is the smallest city in Sherman County, with a population of 172.
There are 4 cities in Sherman County, Oregon.