| Locality | Post Code |
|---|---|
| Beatty, Klamath | 97621 |
| Bly, Klamath | 97622 |
| Bonanza, Klamath | 97623 |
| Chemult, Klamath | 97731 |
| Chiloquin, Klamath | 97624 |
| Crater Lake, Klamath | 97604 |
| Crescent, Klamath | 97733 |
| Crescent Lake, Klamath | 97733 |
| Dairy, Klamath | 97625 |
| Diamond Lake, Klamath | 97731 |
| Fort Klamath, Klamath | 97626 |
| Gilchrist, Klamath | 97737 |
| Keno, Klamath | 97627 |
| Kingsley Field, Klamath | 97601 |
| Klamath Falls, Klamath | 97601, 97603 |
| Malin, Klamath | 97632 |
| Merrill, Klamath | 97633 |
| Midland, Klamath | 97634 |
| Oretech, Klamath | 97601 |
| Sprague River, Klamath | 97639 |
| Worden, Klamath | 97601 |