Founded in 1858, Mason County is one of 254 counties in the state of Texas. Historically, Mason County was formed from Gillespie County. The city of Mason is the county seat. With FIPS code of 319, Mason County has a population of 3,943 and area of 932 square miles (2,414 km2).
List of all cities in Mason County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Art, TX | 76820 | 325 |
| Fredonia, TX | 76842 | 325 |
| Mason, TX | 76856 | 325 |
| Pontotoc, TX | 76869 | 325 |
| Streeter, TX | 76856 | 325 |