| Business | Phone |
| Grande Communications 401 Carlson Cir, San Marcos 78666 | (512) 878-4880 |
| Horizon Telecom Inc 173 Crest Circle Dr, San Marcos 78666 | (512) 396-0848 |
| Internet Aesthetics 215 W San Antonio St # 204, San Marcos 78666 | (512) 392-6551 |
| Internet Technic 16442 N State Highway 123, San Marcos 78666 | (512) 805-0172 |
| Pageluck.Com 701 Aquarena Springs Dr # 104c, San Marcos 78666 | (512) 392-8843 |
| Realtime Communications San Marcos 78666 | (512) 393-3000 |
| San Marcos Internet Inc San Marcos 78666 | (512) 393-5300 |
| Time Warner Cable 1120 Highway 123, San Marcos 78666 | (512) 805-2555 |
| Coefficient Designs San Marcos 78666 | (512) 396-1218 |