| City | County | 2025 Pop. ↓ |
|---|---|---|
| Albany | Linn County | 57,304 |
| Aloha | Washington County | 54,559 |
| Ashland | Jackson County | 20,831 |
| Altamont | Klamath County | 20,617 |
| Astoria | Clatsop County | 9,847 |
| Aumsville | Marion County | 4,108 |
| Amity | Yamhill County | 1,765 |
| Athena | Umatilla County | 1,171 |
| Aurora | Marion County | 1,102 |
| Adair Village | Benton County | 1,040 |
| Arlington | Gilliam County | 643 |
| Adams | Umatilla County | 379 |
| Annex | Malheur County | 358 |
| Alpine | Benton County | 262 |
| Adrian | Malheur County | 157 |
| Alsea | Benton County | 133 |
| Antelope | Wasco County | 39 |