Post Offices List in San Marcos City, Texas:
| San Marcos Post Office | 900 Bugg Ln Ste 110a, San Marcos, TX 78666 |
| San Marcos Annex Post Office | 210 S Stagecoach Trl, San Marcos, TX 78666 |
| San Marcos Post Office | 900 Bugg Ln Ste 110a, San Marcos, TX 78666 |
| San Marcos Annex Post Office | 210 S Stagecoach Trl, San Marcos, TX 78666 |