| Business | Phone |
| Accutech Systems Fairfax 22030 | (703) 352-7475 |
| Alarm Tech Solutions Llc 3225 Gallows Rd, Fairfax 22031 | (703) 204-2087 |
| National Security Training 10410 Main St, Fairfax 22030 | (703) 273-5555 |
| Security Systems Unlimited 10410 Main St, Fairfax 22030 | (703) 771-1000 |