| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Klamath Falls | 1 | 22,175 | 21,887 | 0.29% | 1,104 | 20 | City |
| Merrill | 2 | 866 | 864 | 0.12% | 1,887 | 0 | City |
| Chiloquin | 3 | 771 | 769 | 0.13% | 944 | 1 | City |
| Malin | 4 | 737 | 732 | 0.14% | 1,477 | 0 | City |
| Bonanza | 5 | 419 | 410 | 0.48% | 511 | 1 | Town |
Klamath Falls is the largest city in Klamath County, with a population of 22,175.
Bonanza is the smallest city in Klamath County, with a population of 419.
There are 5 cities in Klamath County, Oregon.