Founded in 1858, Callahan County is one of 254 counties in the state of Texas. Historically, Callahan County was formed from Bexar County, Bosque County, and Travis County. The city of Baird is the county seat. With FIPS code of 59, Callahan County has a population of 14,115 and area of 899 square miles (2,328 km2).
List of all cities in Callahan County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Baird, TX | 79504 | 325 |
| Clyde, TX | 79510 | 325 |
| Cross Plns, TX | 76443 | 254 |
| Eula, TX | 79510 | 325 |
| Putnam, TX | 76469 | 325 |