3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Trinity | 1 | 2,519 | 2,343 | 1.41% | 664 | 3.79 | City |
| Westwood Shores | 2 | 1,627 | 1,821 | 1.94% | 505 | 3.22 | CDP |
| Groveton | 3 | 946 | 915 | 0.64% | 366 | 2.58 | City |
Trinity is the largest city in Trinity County, with a population of 2,519.
Groveton is the smallest city in Trinity County.
There are 3 cities in Trinity County, Texas.