| Business | Phone |
| Advance System & Networking 1803 Monument Blvd # 3f, Concord 94520 | (925) 726-2478 |
| Progressive Systems-Consulting 4425 Treat Blvd # C, Concord 94521 | (925) 827-0200 |
| Acs State & Local Solutions 1849 Willow Pass Rd, Concord 94520 | (925) 687-1355 |
| Bay Computing Group Concord 94520 | (925) 459-8500 |
| Blue Wire Networks Inc 1717 Solano Way, Concord 94520 | (925) 680-9700 |
| Computer Networkng Design Pro 3298 Esperanza Dr, Concord 94519 | (925) 674-1843 |
| Datamatrix 101 John Glenn Dr # 30, Concord 94520 | (925) 689-6719 |
| Elite Network Solutions Concord 94520 | (925) 689-5555 |
| Hidden Lakes Tech Support Po Box 5878, Concord 94524 | (925) 288-0362 |
| Land Technologies 3349 Moretti Dr, Concord 94519 | (925) 692-0011 |
| Network-Iq 3200 Clayton Rd, Concord 94519 | (925) 677-7374 |
| Pure Tech It 2176 Commerce Ave # J, Concord 94520 | (925) 937-8051 |
| Sterling Systems Consulting Po Box 27154, Concord 94527 | (925) 260-6568 |