| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Greenfield | 1 | 2,052 | 2,065 | -0.87% | 1,139 | 2 | City |
| Adair | 2 | 777 | 793 | 0.13% | 351 | 2 | City |
| Fontanelle | 3 | 672 | 689 | -0.15% | 784 | 1 | City |
| Orient | 4 | 352 | 364 | 0% | 809 | 0 | City |
| Bridgewater | 5 | 140 | 146 | -0.71% | 486 | 0 | City |
Greenfield is the largest city in Adair County, with a population of 2,052.
Bridgewater is the smallest city in Adair County, with a population of 140.
There are 5 cities in Adair County, Iowa.