Founded in 1858, McMullen County is one of 254 counties in the state of Texas. Historically, McMullen County was formed from Atascosa County, Bexar County and Live Oak County. The city of Tilden is the county seat. With FIPS code of 311, McMullen County has a population of 608 and area of 1,113 square miles (2,883 km2).
List of all cities in McMullen County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Calliham, TX | 78007 | 361 |
| Tilden, TX | 78072 | 361 |