| Coastline Property Maintenance INC | Adam Roy Grant | — | (714) 770 7521 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Coastline Roofing | Lance Lawrence Olivas | — | (714) 580 6169 | Other roofers | Huntington Beach · Orange County | — | — |
| Coastline Roofing INC | Jason Alexander Jongeneelen | — | (714) 887 6690 | Other roofers | Orange · Orange County | — | — |
| Coastline Roofing Services | Ryan Donald Sieb | — | (949) 246 8616 | Other roofers | Lake Forest · Orange County | — | — |
| Coastline Shades | Mohamad Abdul Hussari | — | (714) 860 4061 | Other | Anaheim · Orange County | — | — |
| Coastline Stone And Tile INC | Keith Michael Baca | — | (949) 289 6155 | Other | Mission Viejo · Orange County | — | — |
| Coastline Summit Group | Van Bich Han | — | (949) 678 3201 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Coastline Tint | Coastline Tint | — | (949) 694 6638 | Other | San Juan Capistrano · Orange County | — | — |
| Coastline Window Replacements | Michael Thomas Stevens | — | (714) 897 9211 | Windows, patio, painters | Westminster · Orange County | — | — |
| Coatto Construction Management INC | Rani Rabbat | — | (714) 488 9680 | GC, remodel, ADU | Stanton · Orange County | — | — |
| Code - 4 Construction | Tapia Victor | — | (714) 878 7566 | GC, remodel, ADU | Orange · Orange County | — | — |
| Code 4 Fire INC | Brian Neil Hoagland | — | (949) 439 1979 | Other | Placentia · Orange County | — | — |
| Code Blue Heating And Cooling LLC | Mohammed Nazih Aoun | — | (714) 396 7731 | HVAC | Cypress · Orange County | — | — |
| Code Fire Systems INC | Alejandro Camacho | — | (714) 471 8621 | Other | Santa Ana · Orange County | — | — |
| Cody Custom Construction INC | John Charles Cody | — | (714) 742 7118 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Cody Ellis Drywall | Cody Ellis Drywall | — | (949) 922 9715 | Other | Mission Viejo · Orange County | — | — |
| Cody Interiors | Cody Interiors | — | (714) 585 5979 | Other | Yorba Linda · Orange County | — | — |
| Cody W Paulsen INC DBA All Pro Electric | Cody Weston Paulsen | — | (949) 412 2796 | Electricians | Mission Viejo · Orange County | — | — |
| Coine General Contracting LLC | Cole Weston Mauri Tripp | — | (949) 386 0821 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Colas Construction Usa INC | John Ryan Harrington | — | (714) 578 9600 | Other | Brea · Orange County | — | — |
| Colas Rail INC | Pascal Alain Stepha Denis | — | (800) 464 9030 | Other | Brea · Orange County | — | — |
| Colby Newett | Colby Newett | — | (949) 646 4388 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Colby Plumbing | Colby Plumbing | — | (949) 463 4706 | Other | San Clemente · Orange County | — | — |
| Colco Properties INC | James Edward Collings | — | (949) 794 9460 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Coldlink Engineering Services INC | Aleksei Butakov | — | (424) 312 6544 | HVAC | Irvine · Orange County | — | — |
| Cole Herrmann | Cole Herrmann | — | (949) 581 9817 | Windows, patio, painters | Lake Forest · Orange County | — | — |
| Cole Othmer | Cole Othmer | — | (714) 501 4122 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Coleman Environmental Engineering INC | Kenneth Joseph Catanzarite | — | (714) 231 2350 | Other | Anaheim · Orange County | — | — |
| Colin Logan | Colin Logan | — | (949) 310 4611 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Colin's Custom Finish Carpentry | Colin's Custom Finish Carpentry | — | (949) 637 8195 | Other | Dana Point · Orange County | — | — |
| Colin's Custom Painting And Decoration INC | Erick Ruben Colin | — | (714) 797 4628 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Colisseum Marble Co INC | Gabriela Alicia Gatti | — | (714) 817 0202 | Other | Santa Ana · Orange County | — | — |
| College Glass & Mirror INC | Debra Ann Mundt | — | (714) 637 4404 | Windows, patio, painters | Orange · Orange County | — | — |
| Collins Builders Incorporated | Robert Jesse Lynn Collins | — | (714) 842 9600 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Collins Custom Builders | Collins Custom Builders | — | (949) 233 0152 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Collins Development Co | James Randall Collins | — | (714) 993 9833 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Collins Framing | Collins Framing | — | (949) 307 3766 | Other | Orange · Orange County | — | — |
| Collins Marble And Tile | Collins Marble And Tile | — | (714) 612 6058 | Other | Laguna Hills · Orange County | — | — |
| Collins Plumbing | Collins Plumbing | — | (949) 413 4973 | Other | Mission Viejo · Orange County | — | — |
| Colonial Carpet Co | Christine Debra Tessier | — | (714) 892 4495 | Other | Garden Grove · Orange County | — | — |