| Business | Phone |
| Baxter Electric 1300 Galaxy Way # 8, Concord 94520 | (925) 687-7175 |
| Delta Electric Co Bay Area 1300 Galaxy Way # 2, Concord 94520 | (925) 602-0510 |
| Allen Electric Concord 94520 | (925) 676-0683 |
| Aloha Electric 1901 Shadywood Ct, Concord 94521 | (925) 671-3860 |
| Battaglini Electric Concord 94520 | (925) 827-2976 |
| California Electric Co 5600 Imhoff Dr, Concord 94520 | (925) 408-3000 |
| Cellco Concord 94520 | (925) 671-0310 |
| Certified Electric Inc Concord 94520 | (925) 686-1199 |
| City Electric 1341 Galaxy Way, Concord 94520 | (925) 689-3236 |
| Clayton Valley Electric Co 5729 Roanwood Way, Concord 94521 | (925) 672-2308 |
| Crown Electric 2273 Acacia Dr, Concord 94520 | (925) 680-8210 |
| Current Electric 115 Mason Cir # E, Concord 94520 | (925) 689-9185 |
| Delta Electric & Pump 1300 Galaxy Way # 2, Concord 94520 | (925) 602-4820 |
| Dmr Electric Concord 94520 | (925) 827-3132 |
| Erloq Inc Po Box 27751, Concord 94527 | (925) 787-4693 |
| Flash Electric Concord 94521 | (925) 595-5049 |
| Flynn Electric 5100 Clayton Rd # B1, Concord 94521 | (925) 672-7999 |
| Gossett Electric 1863 Scott Rd, Concord 94519 | (925) 680-8080 |
| Grover Lighting & Electric 1717 Solano Way # 16, Concord 94520 | (925) 969-9741 |
| Helix Electric Inc 4085 Nelson Ave # I, Concord 94520 | (925) 677-0561 |
| Inter Electric 872 Navaronne Way, Concord 94518 | (925) 363-5358 |
| Jld Electric 4251 Elario Dr, Concord 94518 | (925) 682-9330 |
| Keystone Electric 3442 El Monte Dr, Concord 94519 | (925) 686-1807 |
| L K Comstock & Co Inc 1460 Washington Blvd # B104, Concord 94521 | (925) 673-2110 |
| Live Wire Electric Svc Concord 94520 | (925) 288-0632 |
| Majestic Electric Concord 94520 | (925) 689-6980 |
| Marshall Electric 1030 Orange St, Concord 94518 | (925) 689-7119 |
| Martucci Electric 1910 Meredith Ct, Concord 94521 | (925) 672-9668 |
| Myles Davis Electric Inc Concord 94520 | (925) 686-0175 |
| Northern Electronic Techs 1411 Pear Dr, Concord 94518 | (925) 689-1889 |
| Omo's Electric Co Concord 94520 | (925) 681-0232 |
| Pcs Corp 1717 Solano Way # 18, Concord 94520 | (925) 676-1501 |
| R L Electric Concord 94520 | (925) 680-7293 |
| Rmh Electric Concord 94520 | (925) 798-7178 |
| Sasco Electric Concord 94520 | (925) 459-7100 |
| Shapland Electric 950 Detroit Ave # 5, Concord 94518 | (925) 685-6313 |
| Silverrado Valley Electric Concord 94520 | (925) 969-1111 |
| Simon Electric 1872 Queens Rd, Concord 94519 | (925) 825-8928 |
| Smitty's Electric 4480 Treat Blvd # 118, Concord 94521 | (925) 825-0806 |
| Spartan Electrical Constr Co Concord 94520 | (925) 691-9393 |
| Triple R Electric Concord 94520 | (925) 686-9140 |
| W J Britton Electrical Concord 94520 | (925) 687-0503 |
| CGT Systems Inc. 1870 Arnold Industrial Pl., Ste. 1010, Concord 94520 | (925) 325-5747 |