| A1 Backflow Service INC | Cary James White | — | (209) 607 7383 | Other | Manteca · San Joaquin County | — | — |
| A4g Landscaping | A4g Landscaping | — | (209) 224 6310 | Windows, patio, painters | Lockeford · San Joaquin County | — | — |
| Aa Plumbing | Aa Plumbing | — | (510) 723 4561 | Other | Tracy · San Joaquin County | — | — |
| Aa Pro Heating & Cooling INC | Antonio Renteria | — | (209) 670 5802 | HVAC | Stockton · San Joaquin County | — | — |
| Aa Sign Image INC | Domingo Valenzuela Gamez | — | (209) 983 5023 | Other | Stockton · San Joaquin County | — | — |
| Aa Sign Image Services | Domingo Valenzuela Gamez | — | (209) 983 5023 | Other | Stockton · San Joaquin County | — | — |
| Aaa Backflow Prevention INC | Jordan Cameron Lee | — | (877) 226 3569 | Other | Stockton · San Joaquin County | — | — |
| Aaa Building Construction INC | Chang Soo Ra | aaaurelconstructionllc@gmail.com | (510) 468 7635 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Aaa Locksmith | Daniel Wayne Batty | — | (209) 599 1975 | Other | Ripon · San Joaquin County | — | — |
| Aaa Septic And Rooter | Aaa Septic And Rooter | — | (209) 351 5969 | Other | French Camp · San Joaquin County | — | — |
| Aaa Septic INC | Cameron Michael Fontana | — | (209) 983 5009 | Other | French Camp · San Joaquin County | — | — |
| Aaa Sweeping Solutions INC | Julio Cesar Fernandez Jimenez | — | (408) 417 9563 | Other | Manteca · San Joaquin County | — | — |
| Aaron Shaddy Construction INC | Aaron Leroy Shaddy | — | (209) 470 7557 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Aaron Wheeler Construction | Aaron Iii Wheeler | — | (408) 313 8867 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Abbott Construction | Aundrey W Abbott | — | (209) 479 1229 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| About The House | About The House | — | (209) 810 6457 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Above The Rest Patio Covers & Sunrooms | James Alan Luke | — | (209) 834 1771 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Absolute Electric | David Michael Harmon | — | (209) 305 8866 | Electricians | Tracy · San Joaquin County | — | — |
| Absolute Electrical INC | David Michael Harmon | office@absoluteelectrical.com | (209) 305 8866 | Electricians | Tracy · San Joaquin County | — | — |
| Absolute Plumbing Of San Joaquin County | Howard Wayne Woolems | — | (209) 369 0584 | Other | Stockton · San Joaquin County | — | — |
| Ac/dc Electric 209 | Garza Carlos | — | (209) 751 6292 | Electricians | Stockton · San Joaquin County | — | — |
| Ac/dc Electrical Contractors INC | John Rudolph-bern Muller | — | (209) 832 1212 | Electricians | Stockton · San Joaquin County | — | — |
| Ac/dc Ornamental Iron Works | Ac/dc Ornamental Iron Works | — | (209) 914 4179 | Other | Tracy · San Joaquin County | — | — |
| Accent Carpets | Aldo Anthony Brocchini | — | (209) 835 9763 | Other | Tracy · San Joaquin County | — | — |
| Accomplish Water Heater Service | Peni Langoia Bourke | — | (925) 705 5554 | Other | Tracy · San Joaquin County | — | — |
| Accuflow Plumbing INC | Mike Martin | — | (209) 330 3569 | HVAC | Acampo · San Joaquin County | — | — |
| Accurate Storage Systems | Bryan Keith Chavis | — | (209) 562 9243 | Other | Lodi · San Joaquin County | — | — |
| Ace Builder | Merced Jesus Rodriguez Medrano | — | (530) 990 2579 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Ace Electric Motor & Pump Co | John Thomas Jr Johnson | — | (209) 464 6428 | Electricians | Stockton · San Joaquin County | — | — |
| Ace Home Repairs INC | Randy Gallegos | — | (209) 679 8340 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Acevedo Lath & Plastering INC | Acevedo Galvan Luis | — | (209) 298 7974 | Other | Stockton · San Joaquin County | — | — |
| Acosta Const INC | Acosta Jr Ysidro | — | (209) 333 2153 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| Acrc Construction INC | Christian Saul Ruiz | — | (925) 784 9850 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Action Builders | Action Builders | — | (209) 333 8757 | GC, remodel, ADU | Lockeford · San Joaquin County | — | — |
| Action Cement INC | Richard Wayne Sullivan | — | (209) 369 7000 | Other | Lodi · San Joaquin County | — | — |
| Action Electric | John Howard Valtierra | — | (209) 942 0170 | Electricians | Stockton · San Joaquin County | — | — |
| Action Overhead Door Company | Zovie Damon Shivers | — | (510) 352 6849 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Active Painting | Active Painting | — | (209) 565 7776 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Active Remodeling | Active Remodeling | — | (209) 242 3131 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Ad Insulation | Ad Insulation | alfredo@adinsulation.com | (209) 640 6379 | Other | Tracy · San Joaquin County | — | — |