| 1 - 2 - 3 Plumbing & Rooter | Eduardo Ramirez Alvarado | — | (818) 335 4935 | Other | Sherman Oaks · Los Angeles County | — | — |
| 1 800 Pro-fence | 1 800 Pro-fence | — | (626) 221 9245 | Other | Monrovia · Los Angeles County | — | — |
| 1 Above Technology LLC | Yehuda Eliezer Netkin | — | (323) 325 6373 | Other | Los Angeles · Los Angeles County | — | — |
| 1 Day Rooter & Plumbing INC | Varuzhan Josh Balyan | — | (626) 696 9757 | Other | Hacienda Heights · Los Angeles County | — | — |
| 1 Source Material Handling INC | John M Howard | — | (818) 838 1688 | Other | Glendale · Los Angeles County | — | — |
| 101 Paving Company | Francisco Xaiver Pelayo | — | (818) 370 4281 | Other | Littlerock · Los Angeles County | — | — |
| 101 Plumbing & Rooter | Marco Antonio Chavolla | — | (213) 393 8908 | Other | Los Angeles · Los Angeles County | — | — |
| 1320 Plumbing INC | Henry B Penate | — | (818) 401 7997 | Other | Pacoima · Los Angeles County | — | — |
| 1st Class Fire Safety Compliance | Timothy John Roach | — | (818) 631 8756 | Other | North Hills · Los Angeles County | — | — |
| 1st Class Fireplace & Chimney Inspections INC | Johnny Ray Jr Lankford | — | (661) 310 5131 | Other | Santa Clarita · Los Angeles County | — | — |
| 1st Gen Floorer | 1st Gen Floorer | — | (323) 667 4219 | Other | Los Angeles · Los Angeles County | — | — |
| 1st Sign INC | Allen Yu | — | (626) 336 1616 | Other | La Puente · Los Angeles County | — | — |
| 1st Step Flooring | Sanchez Fernando Nolasco | — | (818) 917 0647 | Other | Pacoima · Los Angeles County | — | — |
| 2 Brothers Custom Cabinets Corp | Marco Antonio Duran Andrade | — | (323) 412 6265 | Other | Los Angeles · Los Angeles County | — | — |
| 20/20 Relining & Rooter | Roque Argote | — | (818) 403 8091 | Other | Palmdale · Los Angeles County | — | — |
| 200 Psi Fire Protection Co | Dong Hun Lee | — | (213) 763 0612 | Other | Northridge · Los Angeles County | — | — |
| 23 1/2 Hrs Plumbing | Jesus Eduardo Arcos Ramirez | — | (323) 245 5246 | Other | Harbor City · Los Angeles County | — | — |
| 24 / 7 Fire Protection Services Incorporated | Richard William Jr Cronin | — | (562) 698 3830 | Other | Santa Fe Springs · Los Angeles County | — | — |
| 24 Hour Rooter INC | Kheirian Diznab Ramin | — | (661) 400 1002 | Other | Palmdale · Los Angeles County | — | — |
| 24 Hours Garage Door And Gates Repair | Peretz Adi | — | (818) 205 4431 | Other | Winnetka · Los Angeles County | — | — |
| 24 Hr Plumbing | Luis Alberto Davila | — | (310) 973 2066 | Other | Lawndale · Los Angeles County | — | — |
| 24 Rooter & Plumbing INC | Gabriel Jovani Robles | — | (626) 322 1538 | Other | Claremont · Los Angeles County | — | — |
| 24/7 Garage Door Experts | Alexander Tchoubikin | — | (206) 619 9951 | Other | Los Angeles · Los Angeles County | — | — |
| 24/7 Leak Detection & Plumbing INC | Cesar Hugo Castellanos | — | (818) 808 7429 | Other | Mission Hills · Los Angeles County | — | — |
| 24/7 Rescue Plumbing Services INC | Jorge Luis Serrano-Barrientos | — | (818) 510 1204 | Other | Van Nuys · Los Angeles County | — | — |
| 2byforward INC | Julian Elmo David Seidenberg | — | (518) 821 4171 | Other | Sylmar · Los Angeles County | — | — |
| 2floor1 | Shifferman Erez | — | (818) 600 2009 | Other | Newhall · Los Angeles County | — | — |
| 2K Sheet Metal Company | Luis Carlos Jr Madero | — | (213) 507 6827 | Other | Los Angeles · Los Angeles County | — | — |
| 2M Plumbing INC | Jaime Danilo Monterroso Mcclaughlin | — | (800) 815 4580 | Other | Van Nuys · Los Angeles County | — | — |
| 2R Plumbing INC | Jose Antonio Ore | — | (323) 629 5341 | Other | Los Angeles · Los Angeles County | — | — |
| 2xm Hardwood Floors | Melvin Estuardo Herrera Y Herrera | — | (310) 237 5848 | Other | Lawndale · Los Angeles County | — | — |
| 3 & 1 Plumbing INC | Sanchez Octavio Elias | — | (818) 605 8601 | Other | Winnetka · Los Angeles County | — | — |
| 3 A Stone Tops INC | Adolfo Tal - Layo Bernabeo | — | (310) 800 8391 | Other | Carson · Los Angeles County | — | — |
| 3 E Group INC | Brian Beauford Phelps | — | (818) 781 7171 | Other | Van Nuys · Los Angeles County | — | — |
| 3 Element Fire Protection | 3 Element Fire Protection | — | (626) 497 2604 | Other | Rosemead · Los Angeles County | — | — |
| 3 Eleven Doors & Gates INC | Juan M Fernandez Diaz | — | (818) 913 5961 | Other | Arleta · Los Angeles County | — | — |
| 3 T Media INC | Joseph Dizor Tolentino | — | (714) 227 6057 | Other | Diamond Bar · Los Angeles County | — | — |
| 3 Ten Plumbing INC | John Darold Senesac | — | (310) 461 9691 | Other | Torrance · Los Angeles County | — | — |
| 3 V Signs & Graphics LLC | Patric Gene Dacy | — | (310) 372 0888 | Other | Torrance · Los Angeles County | — | — |
| 3 Woodworkers INC | Jorge Oscar De Jesus Escorcia | — | (818) 518 3075 | Other | Northridge · Los Angeles County | — | — |