| Business | Phone |
| American Fire Safety 419 N Market St, Frederick 21701 | (301) 846-0740 |
| E-Quip 5713 Industry Ln # 56, Frederick 21704 | (301) 668-9440 |
| Intervid Inc 4650 Wedgewood Blvd, Frederick 21703 | (301) 698-0086 |
| Security Alarm Svc Inc 504 E Church St, Frederick 21701 | (301) 663-4874 |
| Sirus Systems 93 Monocacy Blvd, Frederick 21701 | (301) 695-5300 |