| Business | Phone |
| Lanier Electronics Group Inc Bowie 20715 | (301) 430-0900 |
| Mgm Security Systems Inc 2517 Red Cedar Dr, Bowie 20721 | (301) 390-7794 |
| Cogenex 3000 Eagles Nest Dr, Bowie 20716 | (301) 809-2600 |
| Washington Safety & Security 5306 Lakevale Ter, Bowie 20720 | (301) 775-2410 |