3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Barnesville | 1 | 6,457 | 6,114 | 0.89% | 1,066 | 6 | City |
| Milner | 2 | 826 | 769 | 1.23% | 392 | 2 | City |
| Aldora | 3 | 201 | 164 | 3.08% | 794 | 0 | Town |
Barnesville is the largest city in Lamar County, with a population of 6,457.
Aldora is the smallest city in Lamar County, with a population of 201.
There are 3 cities in Lamar County, Georgia.