| Company Name | Street | Suite | City | St | Zip | Phone | Fax | Website |
| Pro Tech Systems of MD Inc | 9590 Lynn Buff Ct | Ste 12A | Laurel | MD | 20723 | (301) 776-3788 | (301) 776-3229 | |
| Kemco Alarm Company Inc | 8033 Penn Randall Pl | Ste D | Upper Marlboro | MD | 20772 | (301) 735-9327 | (301) 735-0052 | |
| Datawatch Systems Inc | 4401 East West Hwy | Ste 500 | Bethesda | MD | 20814 | (301) 654-3282 | (301) 654-4162 | www.datawatchsystems.com |
| VisionAlarm & Security Services Inc dba VisionAlarm Inc | 12204 Greenridge Dr | Boyds | MD | 20841 | (301) 980-1911 | www.visionalarm.com | ||
| Sentry Installation Inc First Alert Professional | 15940 Derwood Rd | Rockville | MD | 20855 | (301) 670-1008 | (301) 670-4759 | www.sentryinstallation.com | |
| Ultra Guard Security Systems | PO Box 5598 | Derwood | MD | 20855 | (301) 570-0700 | (301) 570-5421 | www.ugss.com | |
| Satellite Industries Inc | 101 Cherrywood Ter | Gaithersburg | MD | 20878 | (301) 840-5420 | (301) 527-1580 | www.satelliteindustries.net | |
| Statewide Alarms Inc | 6616 Lewis Rd | Baldwin | MD | 21013 | (410) 592-5885 | (410) 592-8811 | ||
| Belmar Security | PO Box 1 | Brooklandville | MD | 21022 | (410) 821-4000 | (410) 583-7080 | www.belmarsecurity.com | |
| Risk Management Consultants | 18 Warren Rd | Cockeysville | MD | 21030 | (410) 683-4880 | (410) 666-2249 | www.jemerickrmc.com | |
| Techmark Corporation | PO Box 370 | Hunt Valley | MD | 21030 | (410) 561-7700 | (410) 561-2117 | www.techmarkcorp.com | |
| Secom LLC | 9687 Gerwig Ln | Ste 3A | Columbia | MD | 21046 | (301) 210-0022 | (301) 210-0055 | www.secomllc.com |
| CRS Security Inc | 1811 Fawn Way | Finksburg | MD | 21048 | (410) 876-7264 | (410) 876-7264 | ||
| Vigilant Security Solutions Inc | PO Box 201 | Gambrills | MD | 21054 | (240) 568-8989 | (240) 568-8988 | www.yourvss.com | |
| Signals Communications Systems Inc | 11438 Cronridge Dr | Ste Z | Owings Mills | MD | 21117 | (410) 363-2555 | (410) 363-6099 | www.signals4u.com |
| Diebold Inc | 11447 Cronhill Dr | Owings Mills | MD | 21117 | (410) 581-3300 | www.diebold.com | ||
| ARM Security Systems Inc | 208 Main St | Reisterstown | MD | 21136 | (410) 526-4990 | (410) 526-2950 | www.armsecuritysystems.com | |
| Scotts Alarm Service LLC | 478 Silver Ct | Westminster | MD | 21158 | (443) 605-9939 | (410) 848-6978 | ||
| Dunbar Security Systems Inc | 7675 Canton Center Dr | Baltimore | MD | 21224 | (800) 888-2129 | (410) 285-1966 | www.dunbaralarm.com | |
| Protection One Alarm Monitoring Inc | 3921 Vero Rd | Ste B | Baltimore | MD | 21227 | (410) 247-7701 | (410) 247-5677 | www.protectionone.com |
| GBS Security Systems Inc | 700 Clabber Hill Rd | Church Hill | MD | 21623 | (410) 556-6478 | (410) 758-3779 | www.intercom.net | |
| Alarm Engineering Inc | 2204 W Zion Rd | Salisbury | MD | 21801 | (410) 546-2210 | (410) 546-3354 | www.alarmengineering.com | |
| Associated Alarm Systems Inc | 401 Eastern Shore Dr | Salisbury | MD | 21804 | (508) 775-3442 |