| Business | Phone |
| Calhoun County Auditor 201 W Austin St, Port Lavaca 77979 | (361) 553-4610 |
| Calhoun County Auditor 211 S Ann St, Port Lavaca 77979 | (361) 553-4610 |
| Calhoun County Treasurer 201 W Austin St, Port Lavaca 77979 | (361) 553-4620 |
| Calhoun County Treasurer 211 S Ann St, Port Lavaca 77979 | (361) 553-4620 |
| Calhoun Tax Assessor Collector 211 S Ann St, Port Lavaca 77979 | (361) 553-4433 |