Post Offices List in Calhoun County, Texas:
| Point Comfort Post Office | 3 Lamar St, Point Comfort, TX 77978 |
| Port Lavaca Post Office | 1201 Half League Rd, Port Lavaca, TX 77979 |
| Port O Connor Post Office | 611 W Adams St, Port O Connor, TX 77982 |
| Seadrift Post Office | 518 S Main St, Seadrift, TX 77983 |