7 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Independence | Polk County | 10,442 |
| Irrigon | Morrow County | 2,014 |
| Island City | Union County | 1,124 |
| Ione | Morrow County | 320 |
| Imbler | Union County | 240 |
| Idanha | Marion County | 158 |
| Idaville | Tillamook County | 154 |