| A - Automated Security Gates | A - Automated Security Gates | — | (818) 720 4088 | Alarm and generators | Agua Dulce · Los Angeles County | — | — |
| A D Security INC | Adam David Stelzer | — | (626) 255 1562 | Alarm and generators | Sierra Madre · Los Angeles County | — | — |
| A T D Lock & Security INC | Orly Zevulun | — | (818) 883 7199 | Alarm and generators | Tarzana · Los Angeles County | — | — |
| A V Knight Low Voltage Security | Oswaldo Antonio Barrera Rivera | — | (661) 202 9579 | Alarm and generators | Palmdale · Los Angeles County | — | — |
| Aaa Security Iron | Aaa Security Iron | — | (323) 497 3863 | Alarm and generators | North Hollywood · Los Angeles County | — | — |
| Absolute Lock And Security INC | Jeremiah Daniel Burdette | — | (818) 404 2112 | Alarm and generators | Newhall · Los Angeles County | — | — |
| Acc Security & Surveillance Camera Systems | Acc Security & Surveillance Camera Systems | service@securitycameralosangeles.com | (310) 966-9919 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Accurate Security Center | Accurate Security Center | — | (562) 869 2555 | Alarm and generators | Downey · Los Angeles County | — | — |
| Accuview Video Security INC | Brandon Michael Fackler | — | (661) 450 2288 | Alarm and generators | Palmdale · Los Angeles County | — | — |
| Ace Alarm INC | James Eung-Kyu Chang | — | (213) 739 0366 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Acme Valley Security Services INC | Brett David Salles | — | (877) 266 6411 | Alarm and generators | Van Nuys · Los Angeles County | — | — |
| Acs Security | Acs Security | — | (310) 475-9016 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Aji Low Voltage Security | Aji Low Voltage Security | — | (818) 826 8546 | Alarm and generators | San Fernando · Los Angeles County | — | — |
| Alan Ackerman DBA Altech Security Co | Alan Edward Ackerman | — | (818) 240 0729 | Alarm and generators | Glendale · Los Angeles County | — | — |
| Alert 360 Home & Business Security Los Angeles | Alert 360 Home & Business Security Los Angeles | — | (213) 602-9001 | Alarm and generators | Corona · Los Angeles County | — | — |
| Allied International Security Guards Company | Allied International Security Guards Company | — | (213) 814-3777 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Allied Security And Access LP | William Theron Welsh | — | (213) 232 4729 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Alpha Security Integrations INC | Jose Manuel Istupe Estrada | — | (818) 309 0803 | Alarm and generators | Arleta · Los Angeles County | — | — |
| Amg Security INC DBA Amg Security Evolution | Marco Kenneth | — | (310) 893 1911 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Ample Security Co | Kazimir Haldys | — | (626) 429 2116 | Alarm and generators | West Covina · Los Angeles County | — | — |
| Asap Alarm | Brian David Zavala | — | (877) 270 2021 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| B & B Lock & Security INC | William Van | — | (626) 576 2340 | Alarm and generators | Alhambra · Los Angeles County | — | — |
| Barak Lock & Security Solutions LLC | Barak Ashkenazi | — | (818) 723 6800 | Alarm and generators | Oak Park · Los Angeles County | — | — |
| Boss Security Screens Oc LLC | Elena Ledoux | — | (714) 716 2036 | Alarm and generators | Burbank · Los Angeles County | — | — |
| Budget Security | Budget Security | — | (818) 402 5262 | Alarm and generators | Mission Hills · Los Angeles County | — | — |
| Ca Security Concepts INC | Eugene Nicholas Mitchell | — | (310) 930 5373 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| California Pro Security | California Pro Security | — | (310) 292 3511 | Alarm and generators | Covina · Los Angeles County | — | — |
| California Security Screen Doors | Steven Arthur Floyd | — | (626) 467 3610 | Alarm and generators | Monrovia · Los Angeles County | — | — |
| Certified Security Systems | Certified Security Systems | — | (323) 965 9300 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| Crescenta Valley Lock & Security Service | Angela Elizabeth Cramer | — | (818) 967 1983 | Alarm and generators | La Crescenta · Los Angeles County | — | — |
| Cyber Shield Security | Cyber Shield Security | — | (310) 242-3100 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| D V R Security Solutions | D V R Security Solutions | — | (818) 624 8357 | Alarm and generators | Granada Hills · Los Angeles County | — | — |
| Deterrence Security System | Dario Arnoldo Rivas | — | (818) 669 1009 | Alarm and generators | North Hills · Los Angeles County | — | — |
| Doors Hardware & Security | Rodriguez Omar Macias | — | (562) 991 1747 | Alarm and generators | Bellflower · Los Angeles County | — | — |
| Dvrs | Dvrs | — | (424) 242-3877 | Alarm and generators | Los Angeles · Los Angeles County | — | — |
| E C M Security Systems INC | Melendez Eddie | — | (626) 393 5542 | Alarm and generators | Claremont · Los Angeles County | — | — |
| Electrowave Security INC DBA Connect To Electronics | Sooren Amadian | — | (818) 445 4645 | Alarm and generators | Glendale · Los Angeles County | — | — |
| Escobar Security Solutions INC | Miguel Angel Escobar | — | (310) 938 2451 | Alarm and generators | Hermosa Beach · Los Angeles County | — | — |
| Falcon Security | Dustin Terry Drews | — | (661) 347 6305 | Alarm and generators | Valencia · Los Angeles County | — | — |
| Fortify Security | Lauran Elmastian | — | (866) 941 4443 | Alarm and generators | Van Nuys · Los Angeles County | — | — |