Founded in 1850, Trinity County is one of 254 counties in the state of Texas. Historically, Trinity County was formed from Houston County. The city of Groveton is the county seat. With FIPS code of 455, Trinity County has a population of 13,827 and area of 693 square miles (1,795 km2).
List of all cities in Trinity County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Apple Springs, TX | 75926 | 936 |
| Carlisle, TX | 75862 | 936 |
| Centralia, TX | 75834 | 936 |
| Chita, TX | 75862 | 936 |
| Crecy, TX | 75845 | 936 |
| Friday, TX | 75845 | 936 |
| Glendale, TX | 75862 | 936 |
| Groveton, TX | 75845 | 936 |
| Helmic, TX | 75845 | 936 |
| Josserand, TX | 75845 | 936 |
| Kittrell, TX | 75862 | 936 |
| Lacy, TX | 75845 | 936 |
| Nigton, TX | 75926 | 936 |
| Nogalus, TX | 75845 | 936 |
| North Cedar, TX | 75926 | 936 |
| Pagoda, TX | 75862 | 936 |
| Pennington, TX | 75856 | 936 |
| Sebastopol, TX | 75862 | 936 |
| Trevat, TX | 75845 | 936 |
| Trinity, TX | 75862 | 936 |
| Westville, TX | 75862 | 936 |
| Woodlake, TX | 75865 | 936 |