| City | County | 2026 Pop. ↓ |
|---|---|---|
| Jennings Lodge | Clackamas County | 7,828 |
| Junction City | Lane County | 7,354 |
| Juniper Canyon | Crook County | 3,856 |
| Jefferson | Marion County | 3,289 |
| Jacksonville | Jackson County | 2,952 |
| John Day | Grant County | 1,626 |
| Joseph | Wallowa County | 1,195 |
| Jasper | Lane County | 810 |
| Johnson City | Clackamas County | 556 |
| Jeffers Gardens | Clatsop County | 247 |
| Jordan Valley | Malheur County | 143 |
| Juntura | Malheur County | 25 |