8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wasco | 1 | 453 | 414 | 1.57% | 449 | 1 | City |
| Wasco | 2 | 453 | 416 | 1.57% | 449 | 1 | City |
| Moro | 3 | 397 | 367 | 1.28% | 800 | 0 | City |
| Moro | 4 | 397 | 369 | 1.28% | 800 | 0 | City |
| Rufus | 5 | 290 | 264 | 1.75% | 245 | 1 | City |
| Rufus | 6 | 290 | 264 | 1.75% | 245 | 1 | City |
| Grass Valley | 7 | 169 | 153 | 1.81% | 331 | 1 | City |
| Grass Valley | 8 | 169 | 153 | 1.81% | 331 | 1 | City |
Wasco is the largest city in Sherman County, with a population of 453.
Grass Valley is the smallest city in Sherman County, with a population of 169.
There are 8 cities in Sherman County, Oregon.