| Colorado West Construction | Kevin Richard Fox | — | (951) 514 4942 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Colorful Painting | Chun Ji Lin | — | (951) 545 5624 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Colossal Precision Framing LLC | Perez Vazquez Daniel | — | (714) 980 0780 | Other | Hemet · Riverside County | — | — |
| Colossal Structural Steel INC | Armando Bravo | — | (760) 791 4383 | Other | Indio · Riverside County | — | — |
| Com-tech Mechanical Solutions INC | Anthony Robert Ellington | — | (951) 479 8845 | Other | Corona · Riverside County | — | — |
| Comfort Air Plumbing INC | Roberto Angel Mares | — | (760) 320 5800 | HVAC | Thousand Palms · Riverside County | — | — |
| Comfort Care Heating & Cooling | Comfort Care Heating & Cooling | — | (562) 282 6567 | HVAC | Lake Elsinore · Riverside County | — | — |
| Comfort Electric INC | Scott William Wright | interested@domainmarket.com | (951) 490 5709 | Electricians | Wildomar · Riverside County | — | — |
| Comfort Heroes Air Conditioning And Heating | Dominick Angel Gomez Tienda | — | (760) 899 3607 | HVAC | Palm Desert · Riverside County | — | — |
| Comfort King Heating And Air Conditioning | Steven Paul Gulley | — | (714) 759 7838 | HVAC | Riverside · Riverside County | — | — |
| Comfort Kings Heating And Cooling INC | Caesar Jr Narvaez | — | (951) 566 6726 | HVAC | Menifee · Riverside County | — | — |
| Comfort Knights Heating And Air Conditioning LLC | Brandon Luther Williams | — | (951) 445 5357 | HVAC | Murrieta · Riverside County | — | — |
| Comfort Masters HVAC & Electrical INC | Rafael Pita Hernandez | — | (661) 644 6461 | HVAC | Norco · Riverside County | — | — |
| Comfy Home | Heather June Hekman | — | (909) 768 0124 | HVAC | Calimesa · Riverside County | — | — |
| Comm-pre-tech | Darin John Lemesh | — | (909) 663 2922 | Other | Riverside · Riverside County | — | — |
| Command One Security INC | Robert Lee Sandifer | — | (760) 568 0052 | Electricians | Palm Desert · Riverside County | — | — |
| Commercial Door Medics INC | David Allen Joyce | — | (888) 998 3927 | Other | Riverside · Riverside County | — | — |
| Commercial Fence Co INC | Eduardo Figueroa Barragan | info@commercialincorporated.com | (713) 943-2830 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Commercial Floor Riders LLC | Martin Morales | — | (951) 287 9758 | Other | Winchester · Riverside County | — | — |
| Commercial Gate Co INC | Eldon James Jr Baum | — | (951) 546 6530 | Other | Winchester · Riverside County | — | — |
| Commercial Glazing Contractors INC | Nathan Paul Hernandez | — | (714) 650 4185 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Commercial Property Services | Brad Norman Clark | — | (619) 807 7802 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Commercial Roofing Concepts | Matthew Alan Ortiz | — | (951) 245 8905 | Other roofers | Lake Elsinore · Riverside County | — | — |
| Commercial Roofing Resources INC | David J Bell | — | (951) 704 6135 | Other roofers | Temecula · Riverside County | — | — |
| Commercial Roofing Solutions | Jose Orosquieta | — | (909) 238 5856 | Other roofers | Jurupa Valley · Riverside County | — | — |
| Commercial Tile & Stone | Erwin Eugenio Arevalo Reiche | — | (949) 233 8319 | Other | Corona · Riverside County | — | — |
| Commericial Industrial Finishing Corporation | Guy William Yocom | — | (951) 284 3456 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Common Fence Fencing Co LLC | Harrison Lathan Morgan | — | (951) 805 8492 | Other | Murrieta · Riverside County | — | — |
| Common Ground Electric | Joey Enselmo Tovar | — | (951) 326 4772 | Electricians | Winchester · Riverside County | — | — |
| Common Ground Swimming Pools | Karen Leigh Smith | — | (760) 799 9174 | Windows, patio, painters | Rancho Mirage · Riverside County | — | — |
| Commtrac Floors INC | David Earl Martin | — | (951) 735 2050 | Other | Riverside · Riverside County | — | — |
| Community Construction Services | Edward Joseph Zazueta | — | (951) 278 0497 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Community Mobile Home Services INC | Jonathan Gerald Smith | — | (951) 506 1140 | Other | Temecula · Riverside County | — | — |
| Compare Carpets & Hard Floors INC | Mark David Mc Call | — | (951) 371 7717 | Other | Norco · Riverside County | — | — |
| Compass Builders INC | Alan Lee Regotti | — | (951) 564 1949 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Compass Pest Management | Compass Pest Management | — | (951) 338-5667 | Pest, tile roofs | Riverside · Riverside County | — | — |
| Competition Green Landscape | Competition Green Landscape | — | (760) 641 0643 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Competition Pools LLC | Ryan Daniel Virgo | — | (951) 306 2921 | Pool | Hemet · Riverside County | — | — |
| Competitive Painting INC | Jason Scott Reed | — | (951) 643 9565 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Complete Air Conditioning | Complete Air Conditioning | — | (909) 562 6878 | HVAC | San Jacinto · Riverside County | — | — |