| Air Repair Castelanelli | Michael Lee Castelanelli | — | (209) 712 8270 | HVAC | Lodi · San Joaquin County | — | — |
| Air Squared Mechanical | Jay Donald Friesen | — | (209) 581 9600 | HVAC | Tracy · San Joaquin County | — | — |
| Air Squared Mechanical Service And Maintenance INC | Jay Donald Friesen | — | (209) 581 9600 | HVAC | Tracy · San Joaquin County | — | — |
| Airflo Energy Solutions | Airflo Energy Solutions | — | (661) 747 0711 | HVAC | Stockton · San Joaquin County | — | — |
| Airteks Mechanical Services | Jerome Bernard Iii Bohland | — | (510) 719 0621 | HVAC | Stockton · San Joaquin County | — | — |
| Airway Heating & Air Conditioning | Airway Heating & Air Conditioning | — | (209) 823 7469 | HVAC | Manteca · San Joaquin County | — | — |
| Aispuro Gypsum Board | Aispuro Gypsum Board | — | (209) 666 0450 | Other | Stockton · San Joaquin County | — | — |
| Ak Electrical | Muhammad Azhar Khan | — | (209) 646 5531 | Electricians | Stockton · San Joaquin County | — | — |
| Akaal Refrigeration INC | Jaswinder Singh Binder | — | (510) 467 4244 | HVAC | Tracy · San Joaquin County | — | — |
| Akin Electric LLC | Adam Wesley Akin | — | (916) 501 9656 | Electricians | Woodbridge · San Joaquin County | — | — |
| Al Kramp Specialties | Al Kramp Specialties | — | (209) 601 9964 | Electricians | Stockton · San Joaquin County | — | — |
| Al Toccoli Construction INC | Albert Anthony Toccoli | — | (209) 639 7608 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Alamo Alarm Co INC | Paul Douglas Alamo | info@alamoalarm.com | (209) 369 7749 | Electricians | Woodbridge · San Joaquin County | — | — |
| Alas Constructor | Alas Constructor | — | (209) 244 2716 | GC, remodel, ADU | Thornton · San Joaquin County | — | — |
| Albert Smith Construction | Albert Michael Smith | — | (209) 406 1257 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Alberto Rodriguez Electrical Contractor | Rodriguez Alberto | — | (408) 931 0579 | Electricians | Lathrop · San Joaquin County | — | — |
| Albertson's Flooring Services Partnership | Derek Sofus Albertson | — | (209) 200 2556 | Other | Lodi · San Joaquin County | — | — |
| Albin Construction INC | Jeffrey Brent Albin | — | (209) 601 8768 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| Albor Plumbing | Albor Plumbing | support@webador.com | (209) 610 0332 | Other | Tracy · San Joaquin County | — | — |
| Alcala Construction | Carlos Ignacio Alcala Perez | — | (408) 759 9285 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| Alcala Landscape | Jose Augusto Alcala Piedra | info@alcalalandscape.com | (209) 406 5186 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Aldamas Construction INC | Jose Luis Aldama Escobar | — | (510) 830 5456 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Alegre Cabinets INC | Thomas Martin Alegre | — | (209) 835 1799 | Other | Tracy · San Joaquin County | — | — |
| Alegre Machinery | Alegre Machinery | — | (209) 321 6819 | Other | Tracy · San Joaquin County | — | — |
| Alejo Electric INC | Edwin Johnathon Alejo | — | (209) 513 6165 | Electricians | Stockton · San Joaquin County | — | — |
| Alessandro Peruffo | Alessandro Peruffo | — | (925) 785 9495 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Alex Millwork | Alex Millwork | — | (209) 513 3250 | Other | Stockton · San Joaquin County | — | — |
| Alex Painting | Alex Painting | alex.painting@yahoo.com | (408) 394 1504 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Alexz Glass INC | Garcia Martin Vazquez | — | (510) 303 7453 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Alfonso's Drywall INC | Reynoso Solis Alfonso | — | (209) 727 3031 | Other | Acampo · San Joaquin County | — | — |
| Alfredo's Painting | Alfredo's Painting | alfred_1577@hotmail.com | (510) 394 7866 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| All - American Painting | All - American Painting | — | (209) 426 7786 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| All About Carpentry INC | Ramon Heriberto Navarrete Frayde | — | (209) 922 6423 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| All About Plastering INC | Kristin E| Covington Kristin E Nava | — | (510) 886 6575 | Other | Tracy · San Joaquin County | — | — |
| All Air Heating & Air Conditioning | Kevin William Gutierrez | — | (209) 368 4264 | HVAC | Lodi · San Joaquin County | — | — |
| All American Glass | Mark Stephen Yelland | l943357@pgwag.com | (209) 469 0400 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| All Around Landscaping | All Around Landscaping | — | (209) 401 0708 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| All Around Renovations INC | Ernest Eugene Webster | — | (209) 365 7181 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| All Cal Equipment Services INC | William Samuel Thompson | — | (209) 244 1472 | Other | Stockton · San Joaquin County | — | — |
| All Cal Paving | All Cal Paving | — | (916) 823 0992 | Other | Manteca · San Joaquin County | — | — |