| City | County | 2025 Pop. ↓ |
|---|---|---|
| Jennings Lodge | Clackamas County | 7,749 |
| Junction City | Lane County | 7,256 |
| Juniper Canyon | Crook County | 3,561 |
| Jefferson | Marion County | 3,221 |
| Jacksonville | Jackson County | 2,885 |
| John Day | Grant County | 1,654 |
| Joseph | Wallowa County | 1,224 |
| Jasper | Lane County | 718 |
| Johnson City | Clackamas County | 546 |
| Jeffers Gardens | Clatsop County | 146 |
| Jordan Valley | Malheur County | 140 |
| Juntura | Malheur County | 26 |