Post Offices List in Callahan County, Texas:
| Baird Post Office | 208 W 3rd St, Baird, TX 79504 |
| Clyde Post Office | 615 Elm St, Clyde, TX 79510 |
| Cross Plains Post Office | 101 N Avenue D, Cross Plains, TX 76443 |
| Putnam Post Office | 104 W Travis St, Putnam, TX 76469 |