| Business | Phone |
| Calhoun County Appraisal Dist 426 W Main St, Port Lavaca 77979 | (361) 552-8808 |
| Calhoun County Independent Sch 705 N Nueces St, Port Lavaca 77979 | (361) 552-8114 |
| Calhoun County Independent Sch 605 N Commerce St, Port Lavaca 77979 | (361) 552-9634 |
| Calhoun County Independent Sch 613 N Colorado St, Port Lavaca 77979 | (361) 552-6848 |
| Calhoun County Independent Sch 201 Sandcrab Blvd, Port Lavaca 77979 | (361) 552-4745 |
| Calhoun County Independent Sch 1512 Jackson St, Port Lavaca 77979 | (361) 552-6252 |
| Calhoun County Independent Sch 3 5th St, Port Lavaca 77979 | (361) 552-2334 |
| Calhoun County Independent Sch 1001 Seadrift St, Port Lavaca 77979 | (361) 552-5992 |
| Calhoun County Independent Sch 115 E Ash St, Port Lavaca 77979 | (361) 552-7614 |