17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Klamath Falls | 1 | 21,934 | 21,819 | 0.1% | 1,092 | 20 | City |
| Altamont | 2 | 20,617 | 18,982 | 0.44% | 2,554 | 8 | CDP |
| Keno | 3 | 2,351 | 2,010 | 7.16% | 254 | 9 | CDP |
| Running Y Ranch | 4 | 1,040 | 930 | 7.11% | 219 | 5 | CDP |
| Falcon Heights | 5 | 1,022 | 642 | 7.13% | 2,445 | 0 | CDP |
| Merrill | 6 | 838 | 827 | 0.24% | 1,826 | 0 | City |
| Chiloquin | 7 | 772 | 764 | 0.26% | 945 | 1 | City |
| Malin | 8 | 745 | 734 | 0.27% | 1,493 | 0 | City |
| Oregon Shores | 9 | 485 | 413 | 7.06% | 439 | 1 | CDP |
| Bonanza | 10 | 415 | 404 | 0.48% | 506 | 1 | Town |
| Gilchrist | 11 | 386 | 163 | 7.22% | 1,016 | 0 | CDP |
| Rocky Point | 12 | 385 | 203 | 7.24% | 210 | 2 | CDP |
| Crescent | 13 | 348 | 358 | 7.41% | 298 | 1 | CDP |
| Bly | 14 | 158 | 126 | 7.48% | 187 | 1 | CDP |
| Fort Klamath | 15 | 130 | 31 | 7.44% | 542 | 0 | CDP |
| Chemult | 16 | 120 | 171 | 7.14% | 465 | 0 | CDP |
| Beatty | 17 | 22 | 43 | 4.76% | 23 | 1 | CDP |
Klamath Falls is the largest city in Klamath County, with a population of 21,934.
Beatty is the smallest city in Klamath County, with a population of 22.
There are 17 cities in Klamath County, Oregon.