| A & Bella's Flooring INC | Moises Morales-Orozco | — | (714) 409 7264 | Other | Santa Ana · Orange County | — | — |
| A & F Enterprises INC | John Stanley Johnson | interested@domainmarket.com | (714) 313 8904 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| A & G Master Painting | Adan Catarino Gonzalez Avena | — | (949) 278 4133 | Windows, patio, painters | Anaheim · Orange County | — | — |
| A & H Cleaning Services INC | Annie Castro Duenas | — | (714) 603 8524 | Other | Cypress · Orange County | — | — |
| A & H Communications INC | Deborah Elaine Betts | — | (949) 250 4555 | Electricians | Irvine · Orange County | — | — |
| A & H Refrigeration INC | Holly Le | — | (714) 800 9888 | HVAC | Garden Grove · Orange County | — | — |
| A & J Construction | Jose Humberto Lopez Lemus | — | (714) 925 8546 | Other | Santa Ana · Orange County | — | — |
| A & J Sheet Metal INC | James Joseph Hanna | — | (714) 799 2861 | Other | Stanton · Orange County | — | — |
| A & M Contracting | Anthony Salvatore Marraccino | — | (949) 636 5125 | Other | Lake Forest · Orange County | — | — |
| A & M Family Roofing Corp | Arturo Cruz Martinez Alvarez | info@aandmfamilyroofingcorp.com | (714) 402 0127 | Other roofers | Santa Ana · Orange County | — | — |
| A & M Painting & Decorating INC DBA Asm Construction | John Stanley Johnson | — | (949) 412 5969 | GC, remodel, ADU | Orange · Orange County | — | — |
| A & M Tree Specialist | Vanesa Acevedo | — | (877) 778 7337 | Tree | Anaheim · Orange County | — | — |
| A & R Corporation INC | Ali Reza Fadavi | — | (949) 396 7999 | GC, remodel, ADU | Irvine · Orange County | — | — |
| A & R General Contractor INC | Morales Ruben Zalpa | taxista026@gmail.com | (949) 520 8677 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| A & S Tree Service | Rosas Reyes Antonio De | — | (714) 718 4381 | Tree | Orange · Orange County | — | — |
| A & V Contractors INC | David Tyrone Almendarez | — | (714) 525 3503 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| A & V Restoration Company INC | Valentin Arias Zepeda | — | (714) 760 1990 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| A - 1 Apartment Supply INC | Charles Christopher Grimmett | — | (714) 754 1208 | Other | Fountain Valley · Orange County | — | — |
| A - Better Glass Co | Garry Ward Wileman | — | (949) 496 2929 | Windows, patio, painters | San Clemente · Orange County | — | — |
| A - Frame Contracting | David Monroe Ashley | — | (714) 878 0473 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| A - M Fence Works | A - M Fence Works | — | (714) 675 4576 | Other | Santa Ana · Orange County | — | — |
| A - Plus Maintenance INC | Edil Verzosa Evangelista | — | (949) 632 6028 | Electricians | Costa Mesa · Orange County | — | — |
| A - Plus Plumbing & Rooter | Ralph Dean Dohle | — | (949) 582 2814 | Other | Laguna Niguel · Orange County | — | — |
| A - Star Glass INC | Jack Victor Hargis | — | (714) 846 2343 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| A 1 A Engineering & Construction INC | Song Hong | — | (213) 248 1033 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| A 2 Z Construct INC | Charlene Estelle Jafari | estimates@azconstruct.com | (949) 283 5179 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| A 2 Z Construction Services | Scott Allen Phelps | — | (949) 788 9227 | GC, remodel, ADU | Irvine · Orange County | — | — |
| A 2 Z Plumbing Services INC | Daniel Perry Moller | — | (714) 572 9471 | Other | Placentia · Orange County | — | — |
| A A A Glass Tech U S A | Majid Javid Khairy | — | (714) 870 5212 | Windows, patio, painters | Fullerton · Orange County | — | — |
| A A A Pacific Electric INC | Saeid Mohammad Taghavi | — | (949) 633 2198 | Electricians | Mission Viejo · Orange County | — | — |
| A A A Painting & Maintenance | Tony Andraos Barkhozia | — | (714) 906 2591 | GC, remodel, ADU | Tustin · Orange County | — | — |
| A A Calonestar Electric | Joon Hyun Nam | — | (213) 864 8831 | Electricians | Anaheim · Orange County | — | — |
| A A P M W C INC DBA All American Powerwash | Monte Wayne Cobb | — | (714) 315 0271 | Other | Huntington Beach · Orange County | — | — |
| A A Paint & Custom Finishes INC | Kimberly Rose Gonzales | — | (949) 458 8010 | Windows, patio, painters | Laguna Hills · Orange County | — | — |
| A A Rocha Construction INC | Anthony Arthur Rocha | — | (949) 328 9270 | GC, remodel, ADU | Irvine · Orange County | — | — |
| A Alvarado Painting | A Alvarado Painting | — | (714) 956 5425 | Windows, patio, painters | Anaheim · Orange County | — | — |
| A And G Plumbing Services INC | Alvaro Gomez | — | (949) 498 8185 | Other | San Clemente · Orange County | — | — |
| A Available Affordable Plumber INC | Maxwell Whitney Wichman | — | (714) 408 8160 | Other | Huntington Beach · Orange County | — | — |
| A B A Alarm Company INC | Edward Martin Link | — | (800) 444 2542 | Electricians | Huntington Beach · Orange County | — | — |
| A B C Custom Wood Shutters INC | John Clifford Stahman | — | (949) 595 0300 | GC, remodel, ADU | Lake Forest · Orange County | — | — |