| Business | Phone |
| Aaa Security 5 Stridesham Ct, Baltimore 21209 | (410) 653-9004 |
| Action Alarm Systems Corp 5839 Belair Rd, Baltimore 21206 | (410) 325-3200 |
| Avnet Security Systems 2652 W Patapsco Ave # F, Baltimore 21230 | (410) 525-2690 |
| Baltimore Alarm & Security Inc 5314 Reisterstown Rd, Baltimore 21215 | (410) 358-8600 |
| Maryland Burglar Alarm Co Inc 629 Eastern Blvd, Baltimore 21221 | (410) 780-3100 |
| Coletronic Enterprises 5417 York Rd, Baltimore 21212 | (410) 655-1447 |
| Oracle Surveillance Systems 2622 Lord Baltimore Dr # L, Baltimore 21244 | (443) 436-0700 |
| Ornal Graphics 4300 Maine Ave, Baltimore 21207 | (410) 664-7131 |
| Eagle Alarm Svc 1712 Carswell St, Baltimore 21218 | (410) 235-6867 |
| Pro-Tect Security Systems Inc Baltimore 21220 | (410) 661-7888 |
| Protection One Inc 3921 Vero Rd # A, Baltimore 21227 | (410) 247-7701 |
| Protection Plus Systems Of Md 7920 Shirley Ave, Baltimore 21237 | (410) 592-9747 |
| Guardian Advanced Protection 4810 Harford Rd, Baltimore 21214 | (410) 444-1870 |
| Integrity Telegraph Security Po Box 1743, Baltimore 21203 | (410) 922-7300 |
| Safeway Security Systems 2205 Maple Hill Ct, Baltimore 21207 | (410) 363-0037 |
| Look Out Alarm Systems 1042 S Charles St, Baltimore 21230 | (410) 727-3773 |
| Security Associates Inc Po Box 5499, Baltimore 21285 | (410) 321-1052 |
| Simon Serious Systems Inc 3411 Shelburne Rd, Baltimore 21208 | (410) 764-8550 |
| Alarm Pro 7823 Wise Ave # A, Baltimore 21222 | (410) 284-3535 |
| Alarm Services Of Maryland Inc Baltimore 21220 | (410) 747-8429 |
| Monitrol Inc Baltimore 21212 | (410) 435-6025 |
| Netversant Solutions 900 N Lehigh St, Baltimore 21205 | (410) 522-3700 |
| American Home Alarm Co Inc Baltimore 21222 | (410) 893-2300 |
| Argus Security Inc Po Box 21273, Baltimore 21228 | (410) 659-6900 |
| Protective Instruments Inc 3824 Beech Ave, Baltimore 21211 | (410) 467-4647 |
| R & K Communications 410 E 25th St, Baltimore 21218 | (410) 467-6221 |
| Safeguard Security Systems 7825 E Baltimore St, Baltimore 21224 | (410) 284-2042 |
| Security Design & Application 1216 Bolton St, Baltimore 21217 | (410) 225-2761 |
| Security Unlimited 3106 Pinkney Rd, Baltimore 21215 | (410) 466-7770 |
| Simon Security Systems Inc 3402 Parkington Ave, Baltimore 21215 | (410) 484-7462 |
| Sonitrol Of Baltimore 2631 Sisson St, Baltimore 21211 | (410) 338-1800 |
| Class One Protection 7809 Eddlynch Rd, Baltimore 21222 | (410) 285-4410 |
| Taylor Rogers Enterprises 5523 Silverbell Rd, Baltimore 21206 | (410) 325-7484 |
| Unlimited Security Systems 781 Washington Blvd, Baltimore 21230 | (410) 539-3094 |
| Custom Electronic Systems 6953 Rockfield Rd, Baltimore 21244 | (410) 944-0419 |
| Strat Security Systems Inc 7017 Harford Rd, Baltimore 21234 | (410) 444-2800 |