| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bainbridge | 1 | 14,628 | 14,480 | 0.15% | 715 | 20 | City |
| Attapulgus | 2 | 439 | 456 | -0.68% | 552 | 1 | City |
| Climax | 3 | 264 | 271 | -0.38% | 329 | 1 | City |
| Brinson | 4 | 214 | 220 | -0.47% | 105 | 2 | Town |
Bainbridge is the largest city in Decatur County, with a population of 14,628.
Brinson is the smallest city in Decatur County, with a population of 214.
There are 4 cities in Decatur County, Georgia.