12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Vernon | 1 | 1,813 | 1,926 | -1.2% | 308 | 6 | City |
| Vernon | 2 | 1,813 | 1,922 | -1.2% | 308 | 6 | City |
| Sulligent | 3 | 1,797 | 1,895 | -1.05% | 229 | 8 | City |
| Sulligent | 4 | 1,797 | 1,892 | -1.05% | 229 | 8 | City |
| Millport | 5 | 957 | 1,011 | -1.14% | 174 | 5 | Town |
| Millport | 6 | 957 | 1,009 | -1.14% | 174 | 5 | Town |
| Kennedy | 7 | 422 | 437 | -0.71% | 132 | 3 | Town |
| Kennedy | 8 | 422 | 436 | -0.71% | 132 | 3 | Town |
| Detroit | 9 | 224 | 234 | -0.88% | 169 | 1 | Town |
| Detroit | 10 | 224 | 234 | -0.88% | 169 | 1 | Town |
| Beaverton | 11 | 178 | 185 | -1.11% | 39 | 5 | Town |
| Beaverton | 12 | 178 | 185 | -1.11% | 39 | 5 | Town |
Vernon is the largest city in Lamar County, with a population of 1,813.
Beaverton is the smallest city in Lamar County, with a population of 178.
There are 12 cities in Lamar County, Alabama.