| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stilwell | 1 | 3,923 | 3,697 | 0.8% | 1,120 | 4 | City |
| Westville | 2 | 1,414 | 1,406 | 0.07% | 753 | 2 | Town |
| West Siloam Springs | 3 | 1,073 | 1,032 | 0.66% | 273 | 4 | Town |
| Watts | 4 | 281 | 273 | 0.36% | 528 | 1 | Town |
Stilwell is the largest city in Adair County, with a population of 3,923.
Watts is the smallest city in Adair County, with a population of 281.
There are 4 cities in Adair County, Oklahoma.