| Business | Phone |
| Advanced Automatic Alarm Co 2475 Shadywood Cir, Crofton 21114 | (301) 261-0011 |
| Benchmark Security Systems Inc 7515 Crofton Colony Dr, Crofton 21114 | (410) 451-2664 |
| Maximum Security Co 1702 Picadilly Rd, Crofton 21114 | (301) 261-3600 |
| Petitbon Alarm Co 2125 Baldwin Ave # 10b, Crofton 21114 | (301) 858-0820 |