| Coastal Construction | Kevin Neil Shafer | — | (949) 422 1253 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Coastal Construction Services | Gloss Clarence | — | (310) 505 6581 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Coastal Flooring INC | Hernandez-ponce Steve | — | (951) 514 9952 | Other | Temecula · Riverside County | — | — |
| Coastal General Construction INC | Garcia Chavez Gabriel | — | (310) 547 7704 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| Coastal Home Construction INC | Kevin Moghadasi | — | (951) 331 5545 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| Coastal Turf Synthetic Grass | Coastal Turf Synthetic Grass | — | (661) 674 5146 | Other | Canyon Lake · Riverside County | — | — |
| Coastline Building INC | Robert Todd Everhart | — | (562) 489 6900 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Coastline Construction And Consulting | Daniel Charles Bishop | — | (949) 444 1522 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Coastline Refrigeration | Coastline Refrigeration | — | (909) 772 6119 | HVAC | Riverside · Riverside County | — | — |
| Coastside Painting INC | Wilfredo Roderico Lopez Rosales | info@coastsidepaint.com | (760) 626 6803 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Coatmasters Coatings Installation Group | Maximillian Medina Desphy | — | (951) 413 0240 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Cobalt Property Management | Cobalt Property Management | — | (951) 675-1644 | Property managers | Riverside · Riverside County | — | — |
| Cobano Landscape & Irrigation INC | Rafael Rodriguez Esqueda | — | (760) 775 7030 | Windows, patio, painters | Indio · Riverside County | — | — |
| Cobian Artistic Stone Tile | German Ramses Cobian Elizondo | — | (760) 989 8640 | Other | Coachella · Riverside County | — | — |
| Cobian Electric | Cobian Hector | — | (562) 688 9641 | Electricians | Corona · Riverside County | — | — |
| Cobian Fence Co INC | Cobian Felix | — | (877) 244 9427 | Other | Perris · Riverside County | — | — |
| Cobian Tractor Work Services INC | Alan Fernando Quiles | — | (951) 333 9185 | Other | Perris · Riverside County | — | — |
| Cobos Construction INC | J Ricardo Cobos | — | (951) 329 6261 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Cobra Air Conditioning | Cobra Air Conditioning | — | (951) 581 0557 | HVAC | Perris · Riverside County | — | — |
| Cochran Communication Construction INC | Michael James Cochran | — | (760) 328 6778 | Other | Thousand Palms · Riverside County | — | — |
| Cockrell Electric INC | John Patrick Cockrell | lemonad@jovanny.ru | (760) 864 6233 | Electricians | Bermuda Dunes · Riverside County | — | — |
| Coda Construction LLC | Hunter | etorrez1@comcast.net | (925) 785-6367 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| Coherence Electric | Bryan Alexis Sanchez Perez | info@coherenceelectric.com | (714) 325 9198 | Electricians | Riverside · Riverside County | — | — |
| Cold Air Technologies INC | Garrett Grant Gates | coldairtechnologies@outlook.com | (888) 340 9981 | HVAC | Riverside · Riverside County | — | — |
| Cold King Mechanical LLC | Bradley Joe Gates | coldkingmechanical@gmail.com | (866) 265 3564 | HVAC | Hemet · Riverside County | — | — |
| Cold Star Heating And Air | Cold Star Heating And Air | — | (760) 902 7363 | HVAC | Palm Desert · Riverside County | — | — |
| Coldchella Heating & Air Conditioning | Coldchella Heating & Air Conditioning | — | (760) 610 4222 | HVAC | Cathedral City · Riverside County | — | — |
| Coldiron Mechanical | Coldiron Mechanical | — | (760) 989 0050 | HVAC | La Quinta · Riverside County | — | — |
| Cole Mathew Larby | Cole Mathew Larby | — | (760) 345 5519 | HVAC | Palm Desert · Riverside County | — | — |
| Collins Air | Collins Air | — | (951) 295 8216 | HVAC | Riverside · Riverside County | — | — |
| Collins Construction And Paint | Jeffrey Glenn Collins | — | (760) 851 4992 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Collins Electric | Danny Ray Collins | — | (951) 506 3960 | Electricians | Temecula · Riverside County | — | — |
| Collins Electrical Services | Jeremy Michael Collins | — | (760) 341 8764 | Electricians | Palm Desert · Riverside County | — | — |
| Collins Fabrication | Collins Fabrication | — | (909) 721 1157 | Other | Menifee · Riverside County | — | — |
| Collins Roofing & Repair | Cary Donald Collins | — | (951) 440 8140 | Other roofers | Murrieta · Riverside County | — | — |
| Collins Roofing Pro | Derek Matthew Collins | collinsroofingpro@gmail.com | (951) 519 1051 | Other roofers | Corona · Riverside County | — | — |
| Collins Thermal Engineering | Collins Thermal Engineering | — | (909) 241 3576 | HVAC | Corona · Riverside County | — | — |
| Color Coating INC | Marysol Mesa Dominguez | — | (562) 639 2242 | Windows, patio, painters | Murrieta · Riverside County | — | — |
| Color Craft Innovation | Color Craft Innovation | — | (760) 808 9490 | Windows, patio, painters | Coachella · Riverside County | — | — |
| Color X Painting | Color X Painting | — | (760) 396 6548 | Windows, patio, painters | Indio · Riverside County | — | — |