7 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Keizer | Marion County | 39,065 |
| Klamath Falls | Klamath County | 22,308 |
| King City | Washington County | 4,915 |
| Keno | Klamath County | 2,281 |
| Knappa | Clatsop County | 1,135 |
| Kirkpatrick | Umatilla County | 257 |
| Kings Valley | Benton County | 175 |