4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stilwell | 1 | 3,929 | 3,707 | 0.95% | 1,122 | 4 | City |
| Westville | 2 | 1,425 | 1,409 | 0.21% | 758 | 2 | Town |
| West Siloam Springs | 3 | 1,085 | 1,034 | 0.84% | 276 | 4 | Town |
| Watts | 4 | 280 | 271 | 0.72% | 526 | 1 | Town |
Stilwell is the largest city in Adair County, with a population of 3,929.
Watts is the smallest city in Adair County, with a population of 280.
There are 4 cities in Adair County, Oklahoma.