3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Trinity | 1 | 2,506 | 2,346 | 1.29% | 661 | 4 | City |
| Westwood Shores | 2 | 1,627 | 1,821 | 1.94% | 505 | 3 | CDP |
| Groveton | 3 | 949 | 913 | 0.74% | 367 | 3 | City |
Trinity is the largest city in Trinity County, with a population of 2,506.
Groveton is the smallest city in Trinity County, with a population of 949.
There are 3 cities in Trinity County, Texas.