| Amaro Jc Pro Painting | Juan Carlos Amaro Roman | — | (949) 212 1072 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Amaro Windows & Glass | Amaro Windows & Glass | — | (951) 733 8109 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |
| Amason Industrial Electric | Martinez Andres | — | (562) 572 4816 | Electricians | Norco · Riverside County | — | — |
| Amaya Property Constructions | Sara Naz Nizami | — | (951) 329 6003 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Amazing Force Plumbing & Backflow LLC | Kenneth James Jr Crawford | — | (323) 973 9272 | Other | Corona · Riverside County | — | — |
| Amazing Kitchens & Bath Cabinets | Amazing Kitchens & Bath Cabinets | — | (951) 354 2793 | Other | Riverside · Riverside County | — | — |
| Amazing Synthetic Lawns | Amazing Synthetic Lawns | — | (760) 453 4155 | Other | Wildomar · Riverside County | — | — |
| Amber Air Conditioning Company | Edward Lee Lambert | — | (951) 674 6975 | HVAC | Lake Elsinore · Riverside County | — | — |
| Amber Air Conditioning INC | Edward Lee Lambert | — | (951) 674 6974 | HVAC | Lake Elsinore · Riverside County | — | — |
| Ambient Landscape | Ambient Landscape | — | (714) 913 8231 | Windows, patio, painters | Norco · Riverside County | — | — |
| Ambition Plumbing Sewer & Drains | Ambition Plumbing Sewer & Drains | — | (562) 955 0671 | Other | Hemet · Riverside County | — | — |
| Ambro Electric | Clemente Daniele Ambrosano | — | (310) 980 6653 | Electricians | Temecula · Riverside County | — | — |
| Ambrosio's Concrete | Ambrosio's Concrete | — | (951) 723 0473 | Other | Sun City · Riverside County | — | — |
| Amc Construction Corp | Marcos Ayman Fahim | agustinamingote@gmail.com | (757) 506 2908 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Amen Air | Amen Air | — | (760) 408 9526 | HVAC | Cathedral City · Riverside County | — | — |
| Amer Jakher | Amer Jakher | — | (951) 415 2403 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Amera Construction Cleaning Corp | Rodriguez Javier Moreno | — | (310) 502 2826 | Other | Eastvale · Riverside County | — | — |
| Amerepipe Plumbing | Amerepipe Plumbing | — | (909) 745 5422 | Other | Temecula · Riverside County | — | — |
| America Floor & Design | Neda Mohajeri | — | (714) 566 4488 | Other | Corona · Riverside County | — | — |
| America Pacific Construction INC | Sehgal Ashish | — | (559) 577 9999 | Other | Eastvale · Riverside County | — | — |
| America's Finest Plumbing Company | Jose Jesus Naranjo | — | (619) 941 4518 | Other | Thermal · Riverside County | — | — |
| America's Painting Service | Henry Kihyon Kang | — | (951) 688 4615 | Windows, patio, painters | Corona · Riverside County | — | — |
| America's Plumbing | America's Plumbing | — | (949) 379 0082 | Other | San Jacinto · Riverside County | — | — |
| America's Property Services LLC DBA Aps Rain Gutters | Leonard Hernandez | — | (909) 206 2503 | Other | Riverside · Riverside County | — | — |
| American Air Concepts INC | Cuevas Narciso | — | (951) 532 7932 | HVAC | Perris · Riverside County | — | — |
| American Air Conditioning And Heating | American Air Conditioning And Heating | — | (760) 922 2293 | HVAC | Blythe · Riverside County | — | — |
| American Air Control LLC | Jordan Michael Bertino | — | (951) 407 0311 | HVAC | Corona · Riverside County | — | — |
| American Airflow Heating & Air INC | Jose Antonio Elizondo | — | (323) 394 4758 | HVAC | Moreno Valley · Riverside County | — | — |
| American Appliance Installers | American Appliance Installers | — | (714) 299 1282 | Other | Winchester · Riverside County | — | — |
| American Asphalt South INC | Jeffrey Ralph Petty | — | (909) 427 8279 | Other | Riverside · Riverside County | — | — |
| American Best Electrical Services | Lepedjian Aram | — | (818) 631 3166 | Electricians | Cathedral City · Riverside County | — | — |
| American Boring Company INC | Shawn Dion Granados | — | (909) 528 3435 | Other | Riverside · Riverside County | — | — |
| American Built Drywall Services | Robert Patrick Oleary | — | (951) 757 1016 | Other | Lake Elsinore · Riverside County | — | — |
| American Classic Plumbing | American Classic Plumbing | — | (951) 654 3000 | Other | San Jacinto · Riverside County | — | — |
| American Coast Plumbing | American Coast Plumbing | — | (714) 884 5912 | Other | Norco · Riverside County | — | — |
| American Construction Management Consulting & Supplies | Felipe Jr Espinoza | — | (951) 250 3964 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| American Contracting & Painting | Gregory James Reimann | — | (951) 634 9255 | GC, remodel, ADU | Perris · Riverside County | — | — |
| American Contractors | Juan Carlos Gutierrez | — | (714) 293 9145 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| American Cool Heat Air & Commercial Refrigeration INC | William Cecil Jr Wood | — | (760) 750 0808 | HVAC | Palm Desert · Riverside County | — | — |
| American Cooling | Michael Rios | — | (213) 447 4315 | HVAC | Riverside · Riverside County | — | — |