| Business | Phone |
| West Corp 2954 Treat Blvd # A, Concord 94518 | (925) 609-9378 |
| Bay Alarm Co Concord 94520 | (925) 798-4023 |
| Clifford Mobile Video Audio Concord 94520 | (925) 408-7148 |
| Diablo Retail Systems 2490 Arnold Industrial Way, Concord 94520 | (925) 934-0120 |
| Iwc Security 1717 Solano Way, Concord 94520 | (925) 686-6380 |
| Protection One Alarm 4090 Nelson Ave, Concord 94520 | (925) 602-5363 |
| Tri Security Sound & Srvllnc 1776 Arnold Industrial Way #Aa, Concord 94520 | (925) 356-2656 |