| City | County | 2025 Pop. ↓ |
|---|---|---|
| Keizer | Marion County | 38,048 |
| Klamath Falls | Klamath County | 21,934 |
| King City | Washington County | 4,829 |
| Keno | Klamath County | 2,351 |
| Knappa | Clatsop County | 1,181 |
| Kirkpatrick | Umatilla County | 258 |
| Kerby | Josephine County | 253 |
| Kings Valley | Benton County | 184 |