| 10-4 Plumbing INC | Lopez Juan Davila | — | (951) 692 6355 | Other | Cherry Valley · Riverside County | — | — |
| 1st Gen Plumbing LLC | Gustavo Arturo Lizarraga | — | (951) 897 3617 | Other | Perris · Riverside County | — | — |
| 1V Comunications | Jason Leon Wurtz | — | (626) 400 0449 | Other | Jurupa Valley · Riverside County | — | — |
| 2 2 0 Carpet Installation | 2 2 0 Carpet Installation | — | (951) 565 7149 | Other | Hemet · Riverside County | — | — |
| 2 Down | 2 Down | — | (951) 775 4702 | Other | Murrieta · Riverside County | — | — |
| 20/20 Reglazing & Refinishing | Martinique Danielle Garcia | — | (760) 396 8558 | Other | Desert Hot Springs · Riverside County | — | — |
| 2020 Demolition And Grading INC | Pablo Ortiz | — | (213) 798 9015 | Other | Riverside · Riverside County | — | — |
| 21st Century Network Cabling | 21st Century Network Cabling | — | (310) 918 9840 | Other | Menifee · Riverside County | — | — |
| 24 - 7 Drilling INC DBA 24 - 7 Water Well Drilling | Donald Wayne Kinloch | — | (951) 581 2783 | Other | Norco · Riverside County | — | — |
| 24/7 Erosion Control INC | Juan Esparza Ramirez | — | (951) 943 9351 | Other | Perris · Riverside County | — | — |
| 2nd Chance Backflow Solutions | 2nd Chance Backflow Solutions | — | (909) 477 0018 | Other | Jurupa Valley · Riverside County | — | — |
| 2s2g Contracting INC | Michael Anthony Harrod | — | (714) 602 7855 | Other | Corona · Riverside County | — | — |
| 3 Sixty-five Framers | Cordero Jose Alfredo Blanco | — | (951) 642 1999 | Other | Perris · Riverside County | — | — |
| 3 Sons Plumbing INC | Joel Mark Levine | — | (760) 567 1570 | Other | La Quinta · Riverside County | — | — |
| 357 Waterproofing INC | Fermin Santana Sr Lopez | — | (714) 329 6622 | Other | Corona · Riverside County | — | — |
| 395 Engineering | Eric Magana | — | (951) 529 1204 | Other | Jurupa Valley · Riverside County | — | — |
| 3D Floors | Ulises Daniel Alvarado Cuenca | — | (909) 758 3042 | Other | Moreno Valley · Riverside County | — | — |
| 3G Plumbing INC | Fuentes Daniel Casillas | — | (760) 234 2494 | Other | Indio · Riverside County | — | — |
| 3T Fence LLC | Leah Marie Coffelt | — | (951) 304 9820 | Other | Wildomar · Riverside County | — | — |
| 3X Signs | 3X Signs | — | (951) 394 7003 | Other | Riverside · Riverside County | — | — |
| 4 Any Pos | Raul Barbaro Rovira | — | (888) 426 9767 | Other | Hemet · Riverside County | — | — |
| 4 Com Incorporated | Francisco Cruz Paz | — | (951) 742 8006 | Other | Riverside · Riverside County | — | — |
| 4 S General Engineering INC | Jon Talmadge Stone | — | (951) 733 8888 | Other | Temecula · Riverside County | — | — |
| 4 T Plumbing Co | Thomas Frederick Long | — | (951) 235 2648 | Other | Riverside · Riverside County | — | — |
| 4 West Pipeline INC | Herrera Hernandez Roberto | — | (951) 244 0002 | Other | Canyon Lake · Riverside County | — | — |
| 5 Star Flooring INC | Dustin Lee Garrett | — | (951) 616 9373 | Other | Canyon Lake · Riverside County | — | — |
| 525 Automation INC | Nelson Torres | — | (909) 908 2449 | Other | Homeland · Riverside County | — | — |
| 7 Cs Design INC | Curtis Alan Secor | — | (760) 341 1151 | Other | Palm Desert · Riverside County | — | — |
| 7 Palms Plumbing INC | Miguel Angel Flores Verdugo | — | (760) 771 7608 | Other | Thermal · Riverside County | — | — |
| 9-dam Backflow Testing | 9-dam Backflow Testing | — | (951) 452 8023 | Other | Riverside · Riverside County | — | — |
| A & A Fence Co INC | Hilario Aguilera | — | (951) 538 9424 | Other | Beaumont · Riverside County | — | — |
| A & A Flooring Design INC | Luis Alberto Sanchez Huizar | — | (714) 391 8758 | Other | Mira Loma · Riverside County | — | — |
| A & A Plumbing And Rooter Service | August Ernest Culver | — | (909) 984 5343 | Other | Riverside · Riverside County | — | — |
| A & E Fiber Optic Services | Flores Ranfery | — | (909) 772 2247 | Other | Beaumont · Riverside County | — | — |
| A & E Paving | Carlos Antonio Andres | — | (714) 798 0963 | Other | Moreno Valley · Riverside County | — | — |
| A & G Interior Drywall Services LLC | Gerardo Jr Alfaro | — | (310) 505 9821 | Other | Jurupa Valley · Riverside County | — | — |
| A & J Concrete Cutting & Breaking | Jose Craig Bugarin | — | (760) 535 3161 | Other | Temecula · Riverside County | — | — |
| A & J Environmental Services INC | Christopher Allen Edwards | — | (909) 597 9702 | Other | Riverside · Riverside County | — | — |
| A & J Plumbing | A & J Plumbing | — | (760) 413 6391 | Other | Cathedral City · Riverside County | — | — |
| A & M Plumbing Services | Michael John Herbst | — | (951) 929 2128 | Other | Hemet · Riverside County | — | — |