| 1 - Step Up Electric | Verdugo Eduardo | — | (909) 725 1777 | Electricians | Redlands · San Bernardino County | — | — |
| 24/seven Electric | Joshua Roberto Paniagua | sevenelectric@gmail.com | (626) 848 3171 | Electricians | San Bernardino · San Bernardino County | — | — |
| 3 N 1 Electric INC | Jose Luis Naranjo | — | (909) 562 0864 | Electricians | Chino · San Bernardino County | — | — |
| 4 X 4 Studio | 4 X 4 Studio | csy@systempia.com | (909) 214 9459 | Electricians | Chino · San Bernardino County | — | — |
| A & C Electric INC | Michael Scott Christiansen | — | (626) 786 1754 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A & M Electrical Construction INC DBA A & M Construction | Alecsandru Catinean | — | (909) 674 6364 | Electricians | Redlands · San Bernardino County | — | — |
| A + Electric | Enrique Jr Lopez | — | (310) 350 8151 | Electricians | Upland · San Bernardino County | — | — |
| A A A Electric & Elevator INC | Jen Shou Huang | — | (626) 523 7978 | Electricians | Fontana · San Bernardino County | — | — |
| A A Electric | Oscar Armando Alvarez | — | (714) 492 3761 | Electricians | Hesperia · San Bernardino County | — | — |
| A A Electrical Service | Alan Wayne Addie | — | (310) 714 6915 | Electricians | Fontana · San Bernardino County | — | — |
| A A Martin | A A Martin | — | (909) 291 5554 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A And F Mcguire Electric Co | Adam Christopher Mcguire | — | (909) 252 8644 | Electricians | Chino Hills · San Bernardino County | — | — |
| A D V Electrical Services INC | Richard Steven Thomas | — | (760) 956 2407 | Electricians | Hesperia · San Bernardino County | — | — |
| A E Electric | Albert Charles Ethier | — | (951) 250 4545 | Electricians | Alta Loma · San Bernardino County | — | — |
| A G Engineering INC DBA Albert Gutierrez | Gutierrez Albert | — | (909) 944 8504 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A J Foulkes Electric | Arthur Joseph Foulkes | — | (909) 498 6890 | Electricians | Fontana · San Bernardino County | — | — |
| A N A Building Maintenance | A N A Building Maintenance | — | (840) 216 8519 | Electricians | Fontana · San Bernardino County | — | — |
| A O Electric | Ochoa Arthur | — | (909) 810 9069 | Electricians | Yucaipa · San Bernardino County | — | — |
| A R Electric | Alex David Ramirez | — | (909) 226 1880 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A R Electrical & Plumbing INC | Antonio Israel Lauro | — | (951) 533 5903 | Electricians | San Bernardino · San Bernardino County | — | — |
| A R M Electric | Rodger Lyn Ashby | — | (760) 954 0228 | Electricians | Hesperia · San Bernardino County | — | — |
| A Schuman Electric | Andrew Nathen Schuman | — | (760) 628 5249 | Electricians | Lucerne Valley · San Bernardino County | — | — |
| A T Pearl Electric | Turner Doyle | info@atpearlelectric.com | (760) 330-5323 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A W S Electric | Henry Walter Iii Schobel | — | (951) 317 6999 | Electricians | Yucaipa · San Bernardino County | — | — |
| A&l Systems LLC | Hector Garcia | — | (877) 912 7483 | Electricians | Ontario · San Bernardino County | — | — |
| A+ Electric Services INC | Enrique Jr Lopez | — | (310) 850 8151 | Electricians | Upland · San Bernardino County | — | — |
| A-1 Electrical | Ramon Jr Pando | — | (323) 221 0321 | Electricians | Upland · San Bernardino County | — | — |
| A. Upland Fire Protection INC | Eduardo Jeff | — | (909) 630 2660 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A1 Volt INC | Larry Thomas Jr Stinson | — | (760) 475 4014 | Electricians | Oak Hills · San Bernardino County | — | — |
| Aaa Bear Valley Builders INC | Mark Edward Harris | — | (909) 520 8982 | Electricians | Big Bear City · San Bernardino County | — | — |
| Aaa Network Solutions INC | Cary Charles Staeden | — | (651) 994 6800 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Aaron Ruston | Aaron Ruston | — | (909) 534 6301 | Electricians | Lake Arrowhead · San Bernardino County | — | — |
| Aaron Velasquez Electric | Aaron Roman Viveros | — | (909) 331 1548 | Electricians | Upland · San Bernardino County | — | — |
| Abel Diaz | Abel Diaz | — | (714) 321 5741 | Electricians | Rialto · San Bernardino County | — | — |
| Able Electric | Charles Robert Iii Gunter | — | (714) 287 4762 | Electricians | Ontario · San Bernardino County | — | — |
| Abm Electrical Power Services LLC | Keone Lee Castleberry | — | (800) 597 1225 | Electricians | Ontario · San Bernardino County | — | — |
| Abm Tech Electric | Anthony Brian Burns | — | (909) 481 7347 | Electricians | Alta Loma · San Bernardino County | — | — |
| Absolute Electric Co | Johnathan Michael Laura | — | (760) 880 4988 | Electricians | Morongo Valley · San Bernardino County | — | — |
| AC Power 1 INC | Chris Nelson Gonzalez | — | (909) 835 3126 | Electricians | Ontario · San Bernardino County | — | — |
| Ac/dc Electric | Guy William Milburn | — | (760) 947 9037 | Electricians | Oak Hills · San Bernardino County | — | — |