| Business | Phone |
| National Household Remodelers 11 Gwynns Mill Ct # B, Owings Mills 21117 | (410) 654-3000 |
| National Security Svc Inc 20 Gwynns Mill Ct, Owings Mills 21117 | (410) 363-7444 |
| Ram's Residential Scrty Systms Po Box 447, Owings Mills 21117 | (410) 363-1938 |
| Secure Alarms Po Box 345, Owings Mills 21117 | (410) 517-2444 |
| Securex Alarm Svc Inc Owings Mills 21117 | (410) 356-3300 |
| A-1 Alarms Po Box 391, Owings Mills 21117 | (410) 653-3000 |
| Adi 11500 Cronridge Dr # 120, Owings Mills 21117 | (410) 363-4047 |
| Alarmco Security Systems Inc Po Box 367, Owings Mills 21117 | (410) 363-3388 |
| Alert One Security 11419 Cronridge Dr, Owings Mills 21117 | (410) 356-3660 |
| Bay Security Inc Owings Mills 21117 | (410) 363-1590 |
| Intertech Electronic Systems 12320 Greenspring Ave, Owings Mills 21117 | (410) 453-9164 |