| Business | Phone |
| Century Security Systems 12101 Arbie Rd, Silver Spring 20904 | (301) 622-3996 |
| Residential Burglar Alarm Co Silver Spring 20906 | (301) 598-0615 |
| Priority Security Inc Silver Spring 20910 | (301) 588-6151 |
| Emergency 24 Inc 8607 2nd Ave # 305, Silver Spring 20910 | (301) 588-3700 |
| Emergency Response Systems 10801 Lockwood Dr # 330, Silver Spring 20901 | (301) 681-2556 |