17 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Albany | Linn County | 57,313 |
| Aloha | Washington County | 54,559 |
| Ashland | Jackson County | 20,829 |
| Altamont | Klamath County | 20,617 |
| Astoria | Clatsop County | 9,835 |
| Aumsville | Marion County | 4,207 |
| Amity | Yamhill County | 1,780 |
| Athena | Umatilla County | 1,180 |
| Aurora | Marion County | 1,117 |
| Adair Village | Benton County | 1,038 |
| Arlington | Gilliam County | 616 |
| Adams | Umatilla County | 388 |
| Annex | Malheur County | 358 |
| Alpine | Benton County | 262 |
| Adrian | Malheur County | 161 |
| Alsea | Benton County | 133 |
| Antelope | Wasco County | 38 |