| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia | 1 | 4,641 | 4,836 | -0.83% | 953 | 5 | City |
Columbia is the largest city in Adair County, with a population of 4,641.
Columbia is the smallest city in Adair County, with a population of 4,641.
There is 1 city in Adair County, Kentucky.