| 110/220v Electric Co | Bart Steven Speccia | — | (650) 784 1886 | Electricians | San Bruno · San Mateo County | — | — |
| 3 E Solutions INC | Frank Joseph Sisca | — | (650) 773 2524 | Electricians | San Mateo · San Mateo County | — | — |
| 3 J Electrical | Junling Zeng | — | (415) 568 0719 | Electricians | Pacifica · San Mateo County | — | — |
| 3 Power Electric INC | Alen Naun Rodriguez Flores | info@powerelectric.com | (650) 759 0043 | Electricians | Daly City · San Mateo County | — | — |
| 328 Construction INC | Zhao Young | — | (415) 823 7119 | Electricians | Daly City · San Mateo County | — | — |
| A & K Electric | Sukhpal Singh Sangha | — | (650) 642 1666 | Electricians | San Mateo · San Mateo County | — | — |
| A & Q Electrical INC | Alan Shiwei Ng | — | (415) 623 9930 | Electricians | South San Francisco · San Mateo County | — | — |
| A & S Electric LLC | Anthony Fai Chau | — | (510) 376 9897 | Electricians | South San Francisco · San Mateo County | — | — |
| A A A Christopher Electric INC | Christopher Richard Gay | — | (650) 888 8284 | Electricians | Belmont · San Mateo County | — | — |
| A And L Electric Company | Rangel Armando | — | (650) 578 1854 | Electricians | San Mateo · San Mateo County | — | — |
| A B M 7 Electric | Arnel Bungay Martinez | — | (415) 505 5098 | Electricians | Daly City · San Mateo County | — | — |
| A Barrios General Building Contractor Painting & Decorating | Abner Asael Barrios | — | (415) 264 6092 | Electricians | Redwood City · San Mateo County | — | — |
| A K M Construction | Soe Yee Wai Hin | — | (650) 201 2808 | Electricians | Daly City · San Mateo County | — | — |
| A L V Construction INC | Ana Luna-Victoria | lee.voege@yahoo.com | (650) 670 0804 | Electricians | Redwood City · San Mateo County | — | — |
| A Plus Plumbing | Zaur Mukhamedovic Bolokov | aplusplumbingser@gmail.com | (415) 630 0077 | Electricians | Colma · San Mateo County | — | — |
| A R C Electric | Jordan L Suiter | — | (510) 414 3068 | Electricians | Foster City · San Mateo County | — | — |
| A R Electric | Antonio De Jesus Revuelta De Alba | — | (650) 681 7865 | Electricians | Redwood City · San Mateo County | — | — |
| A&r Electrical Services INC | Christopher Javier Avila Ruano | — | (650) 995 4520 | Electricians | Half Moon Bay · San Mateo County | — | — |
| A/c Electric Design INC | Cassar Anthony | — | (650) 333 1406 | Electricians | Redwood City · San Mateo County | — | — |
| Aa Customs Proav INC | Divnov Alexei | — | (650) 762 9598 | Electricians | San Mateo · San Mateo County | — | — |
| Abcor Electro-mechanical | Abcor Electro-mechanical | — | (415) 290 7610 | Electricians | South San Francisco · San Mateo County | — | — |
| Absolute Electrical | Jeffrey Alden Jonah | office@absoluteelectrical.com | (650) 654 7889 | Electricians | San Carlos · San Mateo County | — | — |
| Acaba Engineering Construction | Amor Canda Bautista | — | (650) 278 6843 | Electricians | San Bruno · San Mateo County | — | — |
| Accent Electric | Bernard Raymond Accristo | — | (650) 483 7653 | Electricians | San Mateo · San Mateo County | — | — |
| Access Cabling | Guido Rene Rodriguez | sales@accesscabling.com | (650) 212 1544 | Electricians | Redwood City · San Mateo County | — | — |
| Achus Electric | George Issac | — | (650) 270 8718 | Electricians | San Bruno · San Mateo County | — | — |
| Adam Electric Company | Farris Ben Adam | — | (415) 244 7474 | Electricians | Daly City · San Mateo County | — | — |
| Adary Electric INC | Nadav Adary | — | (650) 577 1100 | Electricians | Foster City · San Mateo County | — | — |
| Affordable Quality Electric INC | Efrain Arturo Cruz | — | (415) 412 5708 | Electricians | South San Francisco · San Mateo County | — | — |
| Agdg Electric INC | Urias Mardoqueo Portillo | — | (650) 720 3664 | Electricians | Daly City · San Mateo County | — | — |
| Agi Electric INC | Andras Gabriel | — | (650) 364 4865 | Electricians | Redwood City · San Mateo County | — | — |
| Allen Leong | Allen Leong | — | (650) 303 4824 | Electricians | Pacifica · San Mateo County | — | — |
| Allstar Electric Innovations | Jorge Correa Perez | — | (650) 906 5766 | Electricians | San Mateo · San Mateo County | — | — |
| Alonso Electric | Alonso Francisco | — | (650) 574 3445 | Electricians | San Mateo · San Mateo County | — | — |
| Alpha Electric Co | Victor Manuel Gomez | — | (650) 255 9451 | Electricians | Menlo Park · San Mateo County | — | — |
| Alren Electrical | Renato Ocampo Mariano | — | (650) 888 5246 | Electricians | Daly City · San Mateo County | — | — |
| Alvah Contracting LLC | Albert Yu | — | (650) 741 6785 | Electricians | South San Francisco · San Mateo County | — | — |
| Amp Electric | Nick Lauren Boscacci | — | (650) 444 1963 | Electricians | Redwood City · San Mateo County | — | — |
| Andrei Smirnov | Andrei Smirnov | — | (415) 310 9060 | Electricians | San Mateo · San Mateo County | — | — |
| Apex Electric & Plumbing INC | Omar Diego Fernandez | — | (650) 720 1836 | Electricians | Half Moon Bay · San Mateo County | — | — |