17 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 97603 | Klamath Falls | 33,222 |
| 97601 | Klamath Falls | 22,964 |
| 97624 | Chiloquin | 3,643 |
| 97623 | Bonanza | 2,813 |
| 97632 | Malin | 1,600 |
| 97633 | Merrill | 1,246 |
| 97733 | Crescent | 639 |
| 97737 | Gilchrist | 557 |
| 97622 | Bly | 369 |
| 97634 | Midland | 277 |
| 97621 | Beatty | 257 |
| 97626 | Fort Klamath | 251 |
| 97627 | Keno | 229 |
| 97625 | Dairy | 134 |
| 97731 | Chemult | 117 |
| 97639 | Sprague River | 15 |
| 97604 | Crater Lake | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 17 ZCTAs in Klamath County, Oregon (US Census).