4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stilwell | 1 | 3,892 | 3,707 | 0.96% | 1,111 | 4 | City |
| Westville | 2 | 1,422 | 1,409 | 0.14% | 757 | 2 | Town |
| West Siloam Springs | 3 | 1,076 | 1,034 | 0.75% | 274 | 4 | Town |
| Watts | 4 | 278 | 271 | 0.36% | 523 | 1 | Town |
Stilwell is the largest city in Adair County, with a population of 3,892.
Watts is the smallest city in Adair County, with a population of 278.
There are 4 cities in Adair County, Oklahoma.