| Business | Phone |
| Saber Security Systems Inc 150 Texas Ave 105, Round Rock 78664 | (512) 341-8700 |
| Ama Alarms 3512 Winding Way, Round Rock 78664 | (512) 733-6788 |
| Americore Security Agency 555 Round Rock West Dr 236, Round Rock 78681 | (512) 388-7060 |
| Apex Security 4124 N Summercrest Loop, Round Rock 78681 | (512) 238-8693 |
| Wackenhut Corp 810 Hesters Crossing Rd 170, Round Rock 78681 | (512) 828-3700 |
| Striker Systems Inc 1611 Chisholm Trl 240, Round Rock 78681 | (512) 341-9627 |
| Protect America Inc 5100 N I H 35 B, Round Rock 78681 | (512) 218-8833 |