| Business | Phone |
| A-1 Security 13732 Palmetto Cir, Germantown 20874 | (301) 856-3100 |
| Sonavigation Germantown 20874 | (301) 428-0523 |
| Central Maryland Security Syst 19409 Frederick Rd, Germantown 20876 | (301) 253-0413 |
| Rawlings Security & Electric 18702 Ginger Ct, Germantown 20874 | (301) 874-0411 |
| Custom Security Inc 13904 Wanegarden Dr, Germantown 20874 | (301) 428-3298 |
| Guardian Alarm Systems Inc 19401 Walter Johnson Rd, Germantown 20874 | (301) 972-1545 |