| Conveyor Specialties INC | Steven Edward Adams | — | (760) 987 6929 | Other | Hesperia · San Bernardino County | — | — |
| Cook Custom Construction INC | John Lee Ii Cook | — | (909) 771 9752 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Cooley Construction INC | Kelly Anne Trentham | — | (760) 948 8400 | Other | Hesperia · San Bernardino County | — | — |
| Coolwater Pool And Landscape | Mark Steven Nagel | — | (714) 709 9559 | Windows, patio, painters | Chino Hills · San Bernardino County | — | — |
| Cooper Roofing Service INC | J Richard Cooper | — | (909) 985 4025 | Other roofers | Upland · San Bernardino County | — | — |
| Cooper Turf Solutions INC | Philip Kelly Cooper | — | (909) 709 9376 | Windows, patio, painters | Redlands · San Bernardino County | — | — |
| Copeland Electric | Tyler Andrew Iii Copeland | — | (760) 363 3810 | Electricians | Morongo Valley · San Bernardino County | — | — |
| Copp Roofing & Construction INC | George Hillery Copp | — | (909) 336 4074 | Other roofers | Blue Jay · San Bernardino County | — | — |
| Copper Coil Plumbing LLC | Jeremiah E Nazario | info@coppercoilplumbing.com | (760) 800 2645 | Other | Joshua Tree · San Bernardino County | — | — |
| Copper Core Electrical | Collin Duane Van Hooydonk | — | (909) 331 1874 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Copper Plumbing And Drain LLC | Daniel A Garcia | — | (760) 998 7069 | Other | Hesperia · San Bernardino County | — | — |
| Copperhead Electric | Jesus Alejandro Gonzalez Rios | john@doe.com | (909) 509 2836 | Electricians | Ontario · San Bernardino County | — | — |
| Coral Construction And Remodeling | Jiahui Zhang | — | (626) 283 9696 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Coram Deo Painting INC | Angel Romo | — | (626) 456 3685 | Windows, patio, painters | Chino Hills · San Bernardino County | — | — |
| Corbin Air Conditioning Co | Bobby Ray Corbin | — | (909) 628 9440 | HVAC | Chino Hills · San Bernardino County | — | — |
| Cordero Framing | Cordero Framing | — | (909) 648 2747 | Other | San Bernardino · San Bernardino County | — | — |
| Core Construction Group | John Marc Anthony Arredondo | — | (213) 591 4790 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Core Fiber Communications INC | Cameron W Boucher | — | (760) 822 2844 | Other | Upland · San Bernardino County | — | — |
| Corelink Concrete Cutting Services | Perez Johnny | — | (909) 636 1005 | Other | Chino Hills · San Bernardino County | — | — |
| Corey Abrams Electric Service | Corey Glen Abrams | — | (619) 261 8317 | Electricians | Redlands · San Bernardino County | — | — |
| Corguz Signs INC | Isis Ahislim Jimenez | — | (909) 276 6037 | Other | San Bernardino · San Bernardino County | — | — |
| Corh Technology Partners INC | Anthony Michael Bieggar | — | (909) 887 3100 | Electricians | Upland · San Bernardino County | — | — |
| Cornell Custom Construction | Rhonda Lee Luiten | — | (909) 628 3333 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Cornerstone | David John Brombach | ccampbell@cornerstone.com | (202) 912-8909 | GC, remodel, ADU | Lucerne Valley · San Bernardino County | — | — |
| Cornerstone Building Services | Gabriel Lawrence Cortez | — | (562) 447 6591 | GC, remodel, ADU | Adelanto · San Bernardino County | — | — |
| Cornerstone Construction & Remodel INC | Francisco Javier Jr Cardenas | — | (818) 770 0073 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Cornerstone Construction Service INC | Gary Dean Caudle | — | (909) 985 6766 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Cornerstone Development Company | Chad Robert Shaules | — | (760) 503 5545 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| Cornerstone Electric | Christopher Eric Billiter | — | (909) 398 1148 | Electricians | Redlands · San Bernardino County | — | — |
| Cornerstone Engineering Contractors | Scott Matthew Citlau | — | (909) 725 3500 | Other | Highland · San Bernardino County | — | — |
| Cornerstone Renovation INC | Samih William Barsoum | — | (909) 480 3260 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Cornerstone Restoration INC | Brian Steven Dunn | — | (909) 609 6764 | GC, remodel, ADU | Alta Loma · San Bernardino County | — | — |
| Cornerstone Utility Engineering | Chad Robert Shaules | — | (760) 503 5545 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| Cornerstonecc | Chad Robert Shaules | — | (760) 503 5546 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| Corona Coatings Corporation | Carol Ann Johnson | — | (909) 825 1201 | Other roofers | Colton · San Bernardino County | — | — |
| Corona Quality Construction | Nuno Delgado Guillermo | — | (951) 310 5245 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Corona's Carpet & Flooring | Corona's Carpet & Flooring | — | (760) 596 5719 | Other | Victorville · San Bernardino County | — | — |
| Corona's Electrical Services | Timothy James Corona | — | (623) 570 5402 | Electricians | Apple Valley · San Bernardino County | — | — |
| Correa Construction | Ruben Sr Correa | — | (909) 923 5844 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Correct Cryogenics INC | Richard Wayne Davis | info@correctcryogenics.com | (909) 355 0923 | Other | Fontana · San Bernardino County | — | — |