Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Klamath Falls (city), OR | 21,813 |
| 2 | Altamont (CDP), OR | 20,233 |
| 3 | Keno (CDP), OR | 1,980 |
| 4 | Running Y Ranch (CDP), OR | 858 |
| 5 | Merrill (city), OR | 821 |
| 6 | Chiloquin (city), OR | 767 |
| 7 | Falcon Heights (CDP), OR | 680 |
| 8 | Oregon Shores (CDP), OR | 330 |