| 2020 Electric INC | Hernandez Jaime Ruiz | — | (925) 305 9103 | Electricians | Oakley · Contra Costa County | — | — |
| 3D Technical Services INC | Daniel Timothy Farley | — | (925) 691 5543 | Electricians | Clayton · Contra Costa County | — | — |
| 55geeks | Sahar Maher Osman | — | (855) 554 3357 | Electricians | Martinez · Contra Costa County | — | — |
| 680 Home Repair.com | Jason Sangku Pak | — | (510) 364 1214 | Electricians | San Ramon · Contra Costa County | — | — |
| 680 Home Repairs | Steve Hyun Lee | — | (510) 364 1214 | Electricians | San Ramon · Contra Costa County | — | — |
| A & B Electric | Anthony John Belleci | — | (925) 260 9098 | Electricians | Brentwood · Contra Costa County | — | — |
| A & G Energy Source INC | Arturo Gonzalez | — | (925) 305 7434 | Electricians | Antioch · Contra Costa County | — | — |
| A & J Electric | Johnson Nguyen Tran | — | (925) 219 6886 | Electricians | Pittsburg · Contra Costa County | — | — |
| A C Electric | Noel Tria Santos | — | (510) 812 9029 | Electricians | Hercules · Contra Costa County | — | — |
| A M A C Construction & Restoration | Tyler Lynn Douglass | — | (925) 356 2619 | Electricians | Walnut Creek · Contra Costa County | — | — |
| A M G Electric | Anthony Michael Granelli | — | (925) 963 5256 | Electricians | Martinez · Contra Costa County | — | — |
| A S I Alarms | Robert Louis Mundo | info@asialarms.com | (800) 408 4338 | Electricians | Concord · Contra Costa County | — | — |
| A S I Systems INC | Jason Aaron Jones | — | (888) 944 7274 | Electricians | Martinez · Contra Costa County | — | — |
| A3 Smart Home LP DBA Aaa Smart Home | Lance Allen Chapman | — | (925) 840 4777 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Aarnav Builders INC | Nari Pahilajrai Ramchandani | — | (510) 325 3650 | Electricians | Danville · Contra Costa County | — | — |
| Ab Construction | Angel Luis Barros | — | (925) 325 1700 | Electricians | Brentwood · Contra Costa County | — | — |
| Absolute Electric | Ricardo Renee Henriquez | — | (925) 679 1663 | Electricians | Knightsen · Contra Costa County | — | — |
| Absolute Electrical Solutions | Oscar Armando Sermeno | sales@qbic.co.uk | (415) 691 5087 | Electricians | San Pablo · Contra Costa County | — | — |
| AC And Dc Electric | Douglas Richard Azevedo | — | (925) 381 0600 | Electricians | Concord · Contra Costa County | — | — |
| Ac3 | Heidi Getman Mc Leod | — | (510) 865 2455 | Electricians | Lafayette · Contra Costa County | — | — |
| Acdc Power | Calvin Thomas Mougeotte | — | (805) 550 4762 | Electricians | Oakley · Contra Costa County | — | — |
| Ace 1 Electric | Oscar Fernando Jr Aceituno | — | (510) 672 5496 | Electricians | Richmond · Contra Costa County | — | — |
| Ace Systems INC | Jon Andrew Meurer | sales@acesystems.com | (510) 684 3973 | Electricians | El Cerrito · Contra Costa County | — | — |
| Acetop Electric INC | Michael Ernest Behrens | info@3medesign.com | (510) 409 9285 | Electricians | Richmond · Contra Costa County | — | — |
| Acustruct | Daniel William Yust | — | (925) 872 4680 | Electricians | Concord · Contra Costa County | — | — |
| Adriatic Builders LLC | Obradovic Dejan | — | (510) 332 1377 | Electricians | Hercules · Contra Costa County | — | — |
| Affordable Electric | Scott Alan Portier | — | (925) 285 3119 | Electricians | Bay Point · Contra Costa County | — | — |
| Aguayo Electrical Services | Luis Aguayo-Lopez | — | (925) 787 0712 | Electricians | Concord · Contra Costa County | — | — |
| Aguinava Electric INC | Juan Carlos Navarrete Zavala | — | (510) 932 7151 | Electricians | San Pablo · Contra Costa County | — | — |
| Ahmad Jamel Zahran | Ahmad Jamel Zahran | — | (310) 500 9867 | Electricians | Richmond · Contra Costa County | — | — |
| Ajp General Construction | Adolfo Jeronimo-Pina | — | (415) 519 0862 | Electricians | San Pablo · Contra Costa County | — | — |
| Ak Electric | Khosrowjah Ali | — | (510) 621 8405 | Electricians | El Sobrante · Contra Costa County | — | — |
| Al's Electric | Alvaro R Vasquez | — | (925) 584 7464 | Electricians | Pittsburg · Contra Costa County | — | — |
| Albro Electric | Theodore Alexander Albro | — | (341) 242 8132 | Electricians | El Cerrito · Contra Costa County | — | — |
| Alexander Drabkin | Alexander Drabkin | — | (925) 212 0225 | Electricians | Antioch · Contra Costa County | — | — |
| Alexander Toranski | Alexander Toranski | — | (510) 501 2364 | Electricians | Concord · Contra Costa County | — | — |
| Alfa Electric INC | Adan Gustavo Fariasleites | export@alfaelectric.com | (925) 234 5369 | Electricians | Concord · Contra Costa County | — | — |
| Alisto INC | Evelyn Sevilla | — | (925) 279 5000 | Electricians | Walnut Creek · Contra Costa County | — | — |
| All Ground Electric & Concrete INC | Malekzadeh Fariborz | — | (510) 409 5479 | Electricians | Bay Point · Contra Costa County | — | — |
| All Phase Electric | Ceyhan Karluk Arbil | — | (925) 286 6544 | Electricians | Walnut Creek · Contra Costa County | — | — |