8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Altus | 1 | 18,462 | 18,704 | -0.22% | 1,013 | 18 | City |
| Blair | 2 | 705 | 720 | -0.28% | 1,478 | 0 | Town |
| Olustee | 3 | 456 | 465 | -0.22% | 547 | 1 | Town |
| Eldorado | 4 | 312 | 320 | -0.32% | 425 | 1 | Town |
| Martha | 5 | 157 | 162 | -0.63% | 623 | 0 | Town |
| Headrick | 6 | 72 | 74 | 0% | 326 | 0 | Town |
| Elmer | 7 | 62 | 64 | 0% | 147 | 0 | Town |
| Friendship | 8 | 22 | 24 | 0% | 147 | 0 | Town |
Altus is the largest city in Jackson County, with a population of 18,462.
Friendship is the smallest city in Jackson County, with a population of 22.
There are 8 cities in Jackson County, Oklahoma.