10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Paris | 1 | 25,278 | 24,505 | 0.62% | 718 | 35.19 | City |
| Reno | 2 | 3,598 | 3,463 | 0.76% | 877 | 4.10 | City |
| Blossom | 3 | 1,492 | 1,401 | 1.22% | 584 | 2.55 | City |
| Powderly | 4 | 1,269 | 966 | 0.48% | 174 | 7.28 | CDP |
| Roxton | 5 | 560 | 550 | 0.36% | 649 | 0.86 | City |
| Deport | 6 | 555 | 552 | 0.18% | 499 | 1.11 | City |
| Petty | 7 | 197 | 95 | 7.07% | 342 | 0.58 | CDP |
| Toco | 8 | 92 | 91 | 0% | 541 | 0.17 | City |
| Sun Valley | 9 | 74 | 71 | 1.37% | 460 | 0.16 | City |
| Brookston | 10 | 49 | 53 | 6.52% | 67 | 0.74 | CDP |
Paris is the largest city in Lamar County, with a population of 25,278.
Brookston is the smallest city in Lamar County.
There are 10 cities in Lamar County, Texas.