8 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Keizer | Marion County | 39,108 |
| Klamath Falls | Klamath County | 22,241 |
| King City | Washington County | 4,958 |
| Keno | Klamath County | 2,351 |
| Knappa | Clatsop County | 1,181 |
| Kirkpatrick | Umatilla County | 258 |
| Kerby | Josephine County | 253 |
| Kings Valley | Benton County | 184 |