| Business | Phone |
| A & R Security 408 S Independence Ave, Rockford 61102 | (815) 963-0317 |
| A-Accurate Paging 2233 Charles St, Rockford 61104 | (815) 229-8663 |
| Security Alarm 3022 Wallin Ave, Rockford 61101 | (815) 963-4005 |
| Security Techn 7420 Shillington Dr, Rockford 61107 | (815) 397-8027 |
| Per Mar Alarmco 800 13th St, Rockford 61104 | (815) 229-1557 |
| On Line Security Systems Llc 618 E State St, Rockford 61104 | (815) 964-9900 |
| On Line Security Systems Llc 1443 Corporate Way, Rockford 47274 | (812) 522-4341 |