7 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Independence | Polk County | 10,368 |
| Irrigon | Morrow County | 2,014 |
| Island City | Union County | 1,127 |
| Ione | Morrow County | 324 |
| Imbler | Union County | 241 |
| Idanha | Marion County | 157 |
| Idaville | Tillamook County | 125 |