| #1 Pro Elec Jmg INC | Junghoon Song | — | (408) 712 6690 | Electricians | San Jose · Santa Clara County | — | — |
| 'go' Electric | Enrique Jesus Ortiz | — | (323) 222 2370 | Electricians | Los Angeles · Los Angeles County | — | — |
| 009 Electric Company | Sean Michael Saxton | — | (626) 484 7423 | Electricians | Riverside · Riverside County | — | — |
| 1 - Step Up Electric | Verdugo Eduardo | — | (909) 725 1777 | Electricians | Redlands · San Bernardino County | — | — |
| 1 And 1 Electric INC | Khosravi Sami | — | (818) 401 3734 | Electricians | Canoga Park · Los Angeles County | — | — |
| 1 Click Electric | Cody Allyn Phillips | gerencia_comercial@click-electric.com | (760) 504 9282 | Electricians | San Marcos · San Diego County | — | — |
| 1 Electrical Services | Andrew Boyd Davis | — | (858) 914 1211 | Electricians | San Diego · San Diego County | — | — |
| 1 Source Electric | Jeffrey Ryan Vickland | — | (916) 844 8811 | Electricians | Cameron Park · El Dorado County | — | — |
| 1 Source Electrical INC | Carl Joseph Pizzuto | — | (760) 739 1987 | Electricians | San Marcos · San Diego County | — | — |
| 1 Stop Electric | Aaron Austin | — | (559) 636 0595 | Electricians | Visalia · Tulare County | — | — |
| 1 Struct | 1 Struct | info@struct.com | (831) 975 9248 | Electricians | Salinas · Monterey County | — | — |
| 1 Superior Electric INC | Rick Daniel Sullivan | info@superior-electric.com | (949) 933 2749 | Electricians | Newport Beach · Orange County | — | — |
| 1-take Electrical | Victor Alexander Gonzalez | — | (559) 213 4337 | Electricians | Madera · Madera County | — | — |
| 10 Star Electric | Jose Luis Arana | — | (408) 807 5418 | Electricians | San Jose · Santa Clara County | — | — |
| 100X Construction | Paul Mehrshahi | — | (818) 334 9232 | Electricians | Irvine · Orange County | — | — |
| 101 Construction | Kelly Kathleen| Ridge Kelly Kathleen Ridge-plascencia | — | (818) 879 6160 | Electricians | Westlake Village · Ventura County | — | — |
| 101 Electric INC | Kelly Kathleen Ridge-Plascencia | — | (818) 879 6160 | Electricians | Westlake Village · Ventura County | — | — |
| 101 Electrical Solutions INC | Chad Lee Loera-Benefield | — | (805) 765 5065 | Electricians | Oxnard · Ventura County | — | — |
| 1010 Electric | Matt Mohammad Sohrabi | — | (760) 807 5555 | Electricians | San Marcos · San Diego County | — | — |
| 1016 Electric | Giovanni De Jesus Rizo Garcia | — | (951) 437 8485 | Electricians | San Jacinto · Riverside County | — | — |
| 11 Electric LLC | Wes Bruce Farnsworth | — | (310) 948 8701 | Electricians | Marina Del Rey · Los Angeles County | — | — |
| 110/220v Electric Co | Bart Steven Speccia | — | (650) 784 1886 | Electricians | San Bruno · San Mateo County | — | — |
| 1111 Construction | Chad Edward Emery | guy@infinitydesignbuild.com | (760) 420 7236 | Electricians | Vista · San Diego County | — | — |
| 11B Renewables INC | Otto Ivan Pena | — | (213) 479 5960 | Electricians | Fullerton · Orange County | — | — |
| 1320 Electric | Juan Jose Corona | — | (951) 642 8393 | Electricians | Riverside · Riverside County | — | — |
| 1503 Electric INC | Jesus Cirigo Morin | — | (714) 200 9107 | Electricians | Tustin · Orange County | — | — |
| 153 Cornerstone Construction INC | Il-Lae Cho | gwebb@cornerstone-construction.com | (832) 259-2520 | Electricians | Fremont · Alameda County | — | — |
| 1980 Co LLC | Patrick Paygar Jr Boyd | — | (818) 489 6403 | Electricians | Monrovia · Los Angeles County | — | — |
| 1H Electric LLC | Bryan Ray Howell | — | (559) 260 1729 | Electricians | Lemoore · Kings County | — | — |
| 1P Electric | Juan Pablo Zamora Garcia | contact@1pelectric.com | (510) 826 6905 | Electricians | Hayward · Alameda County | — | — |
| 1st Atrium INC | Arne Edgar Perthus | — | (760) 880 6606 | Electricians | Palm Desert · Riverside County | — | — |
| 1st Choice Design & Development | Tony Gene Holder | — | (844) 292 3700 | Electricians | Orange · Orange County | — | — |
| 1st Choice Electric Enterprises INC | Marcos Antonio Vazquez | — | (209) 809 5021 | Electricians | Modesto · Stanislaus County | — | — |
| 1st Choice Electric INC | Jerrett Scott Bruemmer | — | (909) 247 5849 | Electricians | Norco · Riverside County | — | — |
| 1st Choice Electric Service | James Dale Smith | 1stchoiceelectricservice@gmail.com | (415) 328 5711 | Electricians | Fairfield · Solano County | — | — |
| 1st City Electrical Contractors | Robert William Griffin | — | (213) 595 1564 | Electricians | Compton · Los Angeles County | — | — |
| 1st Class Electric | Javier Percy Alejos | — | (510) 305 8376 | Electricians | San Leandro · Alameda County | — | — |
| 1st Light Sales Corp | Justin Kenneth Krum | — | (209) 456 5415 | Electricians | Manteca · San Joaquin County | — | — |
| 1st Place Electric Company INC | Mark Gregory Smith | mark@1stplaceelectric.com | (949) 430-7001 | Electricians | San Juan Capistrano · Orange County | — | — |
| 1st Security & Sound | Robert Tracey Wright | — | (209) 522 6180 | Electricians | Modesto · Stanislaus County | — | — |