| Allison's Construction | Kevin John Allison | — | (209) 556 8836 | Other | Oakdale · Stanislaus County | — | — |
| Allred Brothers Construction | Dustyn Allyn Souza Allred | — | (559) 302 0250 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Almond Valley Roofing INC | Roberto Carlos Delgado Gomez | — | (209) 621 9242 | Other roofers | Ceres · Stanislaus County | — | — |
| Alpha Painting | Alpha Painting | — | (209) 523 6213 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Alpha Valley Concrete | Manuel Heriberto Lopez Felix | — | (209) 493 0785 | Other | Oakdale · Stanislaus County | — | — |
| Als Interlocking Pavers INC | Andreina Elizabeth Lopez Serrano | — | (408) 380 9192 | Other | Ceres · Stanislaus County | — | — |
| Alta California H V A C | Frank Anthony Quiroga | — | (510) 589 3880 | HVAC | Patterson · Stanislaus County | — | — |
| Alta Electrical Group | Jesse Manuel Rodriguez | — | (209) 480 2086 | Electricians | Patterson · Stanislaus County | — | — |
| Alternative Electric | Miguel Angel Areola | — | (510) 676 1824 | Electricians | Modesto · Stanislaus County | — | — |
| Alturas Tree Services | Jose Mercedes Reyes | — | (209) 300 9383 | Tree | Modesto · Stanislaus County | — | — |
| Aluma - Clad | Aluma - Clad | info@alumaclad.com | (209) 814 9323 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| Alvarado Brother Painting | Alvarado Brother Painting | — | (408) 230 7872 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Alvarado Brothers Painting LLC | Alvarado Brothers Painting LLC | — | (209) 799-4799 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Alvarado Builds | Alvarado Builds | — | (209) 495 6081 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Alvarez Finish Carpentry INC | Rodolfo Alvarez | — | (209) 495 6139 | Other | Waterford · Stanislaus County | — | — |
| Alvaro Ramirez General Contractor | Alvaro Ramirez General Contractor | — | (415) 370 8433 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Am Hardwood Floors INC | Alejandro Arreola Medina | — | (650) 670 5257 | Other | Modesto · Stanislaus County | — | — |
| Amador Flooring | Amador Flooring | — | (209) 380 0935 | Other | Waterford · Stanislaus County | — | — |
| Ameri-pride C&c INC | Ryan Joseph Esteves | — | (209) 701 8676 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| America Home Pros INC | Thompson Josephine | info@americahomepros.com | (209) 499 8564 | Electricians | Knights Ferry · Stanislaus County | — | — |
| America Plus One Flooring Modesto | America Plus One Flooring Modesto | — | (209) 602 9472 | Other | Modesto · Stanislaus County | — | — |
| American Choice Enterprises INC | Daniel Y Antonov | — | (209) 681 6263 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| American Eagle Environmental INC | George Lozano Fajardo | — | (209) 857 6117 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| American Elite Electric INC | Glen Keith Pennycuff | — | (209) 479 2750 | Electricians | Turlock · Stanislaus County | — | — |
| American Glass Company | Albert Robert Campopiano Jr | interested@domainmarket.com | (209) 522 7007 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| American Liberty Roofing INC | Jesus Cervantes Aranda | — | (209) 579 9891 | Other roofers | Modesto · Stanislaus County | — | — |
| American Overhead Door & Gate INC | Matthew Allen Morris | — | (209) 613 1275 | Other | Modesto · Stanislaus County | — | — |
| American Pavement Systems INC | Gregory Brien Reed | ap@americanpavementsystems.com | (209) 522 2277 | Other | Modesto · Stanislaus County | — | — |
| American Pump Company | Ryan Christopher Clipper | — | (209) 770 2811 | Other | Hughson · Stanislaus County | — | — |
| American Quality Industrial Construction INC | Ramon Morales Villarreal | — | (209) 541 3756 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| American Restoration Water Fire & Mold Damage | Anthony Andy Hernandez | — | (209) 606 9246 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| American Roofing Services INC | Gomez Oscar | — | (209) 495 5912 | Other roofers | Modesto · Stanislaus County | — | — |
| American System Controls And Integration INC | Randall Jerry Swier | — | (209) 593 1176 | Other | Modesto · Stanislaus County | — | — |
| American Tree Service | Matthew Paul Baker | — | (209) 872 6666 | Tree | Modesto · Stanislaus County | — | — |
| American Welding Company | Chester Lee Iii Gaston | — | (209) 777 9613 | Other | Denair · Stanislaus County | — | — |
| American Wood Design & Trim | American Wood Design & Trim | — | (209) 505 0277 | Other | Hughson · Stanislaus County | — | — |
| Amerine Systems Incorporated | Gary Dean Amerine | — | (209) 847 5968 | HVAC | Oakdale · Stanislaus County | — | — |
| Amos Landscape Painting & Fencing INC | Amos Edward Iii Santwier | — | (209) 606 9638 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Amp Electric | Gregory Matthew Schmidt | — | (209) 961 5500 | Electricians | Turlock · Stanislaus County | — | — |
| Amr Concrete | Amr Concrete | — | (209) 735 0075 | Other | Waterford · Stanislaus County | — | — |