| #1 Son Plumbing INC | James Lincoln Stanfield | — | (909) 904 3774 | Other | Highland · San Bernardino County | — | — |
| 1 Teamwork Fire Protection LLC | Austin Allen Holmes | — | (909) 390 8392 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| 138 Communications INC | Matthew George Schrum | — | (303) 378 1145 | Other | Upland · San Bernardino County | — | — |
| 1st Class Plumbing Repair Service INC | Perez Marcos | — | (909) 804 2476 | Other | San Bernardino · San Bernardino County | — | — |
| 2 R Drilling INC | Brian Craig Serl | — | (909) 490 0530 | Other | Chino · San Bernardino County | — | — |
| 2 Sharp | Steven Roy Sharpless | — | (951) 833 7800 | Other | Redlands · San Bernardino County | — | — |
| 21 Plumbing | 21 Plumbing | — | (909) 477 1600 | Other | Yucaipa · San Bernardino County | — | — |
| 23 1/2 Hrs S O S Plumbing INC | Francisco Javier Macias | — | (626) 786 4999 | Other | Montclair · San Bernardino County | — | — |
| 24-7 Dock And Door Repair INC | Roberto Renteria Larios | — | (951) 205 4058 | Other | San Bernardino · San Bernardino County | — | — |
| 24/7 Plumbing & Rooter | 24/7 Plumbing & Rooter | — | (760) 780 9365 | Other | Victorville · San Bernardino County | — | — |
| 29 Palms Fencing | 29 Palms Fencing | — | (760) 367 6964 | Other | 29 Palms · San Bernardino County | — | — |
| 360 Finish Carpentry LLC | Nathan David Ray Pawling | — | (909) 744 2074 | Other | Mentone · San Bernardino County | — | — |
| 3D Stairs | 3D Stairs | — | (909) 749 1757 | Other | Adelanto · San Bernardino County | — | — |
| 4D Milling INC | Chandler Joseph Anglin | — | (909) 709 7757 | Other | Oak Glen · San Bernardino County | — | — |
| 4D Surface Management INC | Michael Chris Doucette | — | (909) 797 0419 | Other | Yucaipa · San Bernardino County | — | — |
| 4je Plumbing | 4je Plumbing | — | (909) 638 9446 | Other | Fontana · San Bernardino County | — | — |
| 4S Epoxy & Polish Concrete INC | Silvia Sanchez | — | (909) 270 6970 | Other | Ontario · San Bernardino County | — | — |
| 5 Star Plumbing LLC | Fernando Jr Sanchez | — | (909) 841 1057 | Other | Colton · San Bernardino County | — | — |
| 5 Stars Plumbing & Sewer | 5 Stars Plumbing & Sewer | — | (510) 220 8859 | Other | Bloomington · San Bernardino County | — | — |
| 811 Plumbing | 811 Plumbing | — | (951) 481 8080 | Other | Rialto · San Bernardino County | — | — |
| 848 Designs INC | Daniel Ramon Gurule-Avendano | — | (909) 520 5195 | Other | Rialto · San Bernardino County | — | — |
| 91 Volts | 91 Volts | — | (951) 232 7029 | Other | Alta Loma · San Bernardino County | — | — |
| 9500 Engineering Construction | Gregory Alan Gates | — | (909) 627 0200 | Other | Chino · San Bernardino County | — | — |
| A & B Window Treatment Incorporated | Barbaro N Basulto Acosta | — | (909) 561 5453 | Other | Fontana · San Bernardino County | — | — |
| A & C Professional Plumbing Corp | Fabiola Cortez | — | (909) 278 2166 | Other | Rialto · San Bernardino County | — | — |
| A & J Plumbing Company | Art Cortez | — | (877) 267 7567 | Other | Colton · San Bernardino County | — | — |
| A & J Scaffold INC | Noemi Villagomez | levi@ajscaffold.com | (909) 214 4323 | Other | Fontana · San Bernardino County | — | — |
| A & L Plastering | A & L Plastering | — | (909) 827 7400 | Other | Fontana · San Bernardino County | — | — |
| A & R Concrete & Hardscape | Richard John Harvey | richard@arconcretehardscape.com | (909) 908 5561 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| A & R Concrete Construction | Denis Samuel Zepeda | — | (909) 800 1657 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| A & R Plastering | A & R Plastering | — | (760) 947 5443 | Other | Hesperia · San Bernardino County | — | — |
| A & R Tarpaulins INC | Kenneth Glenn Weisbart | — | (909) 829 4444 | Other | Fontana · San Bernardino County | — | — |
| A & R Welding And Repair | Reyes Angel | — | (760) 493 0157 | Other | Hesperia · San Bernardino County | — | — |
| A & Son's Concrete INC | Armando Medina Jr Vargas | — | (909) 282 2164 | Other | Ontario · San Bernardino County | — | — |
| A + Millwork Casework Installations | Montoya Ricardo | — | (951) 642 1851 | Other | Fontana · San Bernardino County | — | — |
| A - 1 Door | A - 1 Door | — | (760) 995 6621 | Other | Victorville · San Bernardino County | — | — |
| A - 1 Garage Doors & Repairs | Jeffrey Joseph Mccarthy | — | (909) 355 1376 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| A - 1 Plumber | A - 1 Plumber | — | (760) 242 4737 | Other | Apple Valley · San Bernardino County | — | — |
| A - Advantage Plumbing | A - Advantage Plumbing | — | (909) 790 5900 | Other | Yucaipa · San Bernardino County | — | — |
| A - C Reglazing | A - C Reglazing | — | (909) 973 0988 | Other | Ontario · San Bernardino County | — | — |