Post Offices List in Gonzales County, Texas:
| Cost Post Office | 136 S Fm 466, Cost, TX 78614 |
| Gonzales Post Office | 920 N Saint Joseph St Ste 105, Gonzales, TX 78629 |
| Harwood Post Office | 13078 Us Highway 90 W, Harwood, TX 78632 |
| Leesville Post Office | 9606 N State Highway 80, Leesville, TX 78122 |
| Nixon Post Office | 109 E 2nd St, Nixon, TX 78140 |
| Smiley Post Office | 401 W Us Highway 87, Smiley, TX 78159 |
| Waelder Post Office | 423 W Us Highway 90, Waelder, TX 78959 |