| 2nd Generation Fencing | 2nd Generation Fencing | — | (209) 923 3080 | Other | Valley Springs · Calaveras County | — | — |
| 49er Rooter And Drain Service INC | Michael Anthony Pizzano | — | (831) 818 0519 | Other | Copperopolis · Calaveras County | — | — |
| A & A Builders | John Mikel Aceves | — | (209) 217 7975 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| A A A A Painting | A A A A Painting | — | (530) 798 3343 | GC, remodel, ADU | Altaville · Calaveras County | — | — |
| A Home Center | A Home Center | — | (209) 288 9584 | GC, remodel, ADU | Vallecito · Calaveras County | — | — |
| A Jordan Construction | Anthony Noel Jordan | — | (209) 728 0930 | GC, remodel, ADU | Avery · Calaveras County | — | — |
| A L Guy Jordan Co | Arnold Lee Jordan | — | (209) 663 5536 | Other | Altaville · Calaveras County | — | — |
| A M D Construction | Angelo Michael Dellanini | — | (209) 768 4879 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| A W Miller Enterprises INC | Aaron Walter Miller | — | (209) 728 2600 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| A-1 Land Management INC | Ronald Lee Nichols | — | (209) 736 6786 | Tree | Angels Camp · Calaveras County | — | — |
| Abbey Water Well Service INC | Steven Lyle Watson | — | (209) 887 2990 | Other | Valley Springs · Calaveras County | — | — |
| AC Electric & Custom Design Lighting INC | Andrew Scott Chapman | — | (209) 382 6303 | Electricians | Copperopolis · Calaveras County | — | — |
| Accurate Estimates INC | Thomas James Koester | — | (209) 785 7700 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Aces Painting And Fine Finishes | Aces Painting And Fine Finishes | — | (209) 728 8464 | Windows, patio, painters | Murphys · Calaveras County | — | — |
| Adam's Asphalt | Adam's Asphalt | — | (209) 540 7496 | Other | Murphys · Calaveras County | — | — |
| Adams Construction | Bryan Timothy Adams | — | (209) 814 7654 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Adams Construction | Richard Cecil Adams | — | (209) 217 6315 | GC, remodel, ADU | Burson · Calaveras County | — | — |
| Advanced Contracted Engineering | Advanced Contracted Engineering | — | (209) 256 7726 | Other | Valley Springs · Calaveras County | — | — |
| Afford-a-door INC | John Ross Spero | — | (209) 327 8585 | Other | Valley Springs · Calaveras County | — | — |
| Affordable Overhead Door Co | Gary Lee Price | — | (209) 556 8334 | Other | Valley Springs · Calaveras County | — | — |
| Ahmad S Al-ruosan | Ahmad S Al-ruosan | — | (209) 483 0154 | GC, remodel, ADU | Wallace · Calaveras County | — | — |
| Air Kind HVAC | Air Kind HVAC | daniel@airkindhvac.com | (209) 715 0500 | HVAC | Burson · Calaveras County | — | — |
| Air One HVAC Systems INC | Christopher Joseph Magoon | — | (925) 207 5005 | HVAC | Altaville · Calaveras County | — | — |
| Air Solutions Heating & Cooling | Air Solutions Heating & Cooling | — | (209) 832 2844 | HVAC | Copperopolis · Calaveras County | — | — |
| Aire Serv Of Stockton | Bryan Joseph Harris | — | (209) 920 5777 | HVAC | Valley Springs · Calaveras County | — | — |
| Aireserv Of Gold Country | Sam Lyon Harris | — | (209) 920 5777 | HVAC | Valley Springs · Calaveras County | — | — |
| Alcantara Roofing | Alcantara Roofing | — | (760) 845-6329 | Other roofers | Vista · Calaveras County | — | — |
| All American Cabinet & Fixture Co | Scatena Robert | — | (209) 327 5974 | Other | Valley Springs · Calaveras County | — | — |
| All Phase Construction | Terry Lee Gates | — | (209) 304 0698 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| All Property Real Estate | All Property Real Estate | — | (209) 754-1510 | Property managers | San Andreas · Calaveras County | — | — |
| Alpine Tile And Stoneworks | Alpine Tile And Stoneworks | — | (209) 728 3100 | Other | Murphys · Calaveras County | — | — |
| Alteristic Painting And Decorating | Alteristic Painting And Decorating | — | (209) 981 3326 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Amador Engineering | Brady Paul Davis | — | (209) 969 7860 | Other | Valley Springs · Calaveras County | — | — |
| Amber Stone | Calaveras County Real Estate Broker | Dre 02134170 | Amber Stone | Calaveras County Real Estate Broker | Dre 02134170 | — | (209) 897-0237 | Property managers | Arnold · Calaveras County | — | — |
| American Building Concept INC | Christopher Joseph White | — | (209) 772 2464 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| American Custom Homes | American Custom Homes | — | (925) 290 5974 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| American Tile Cleaning & Hard Surface Restoration | Kenneth Brian Brooks | — | (209) 419 2251 | Restoration | Valley Springs · Calaveras County | — | — |
| American Wood Scapes | American Wood Scapes | — | (505) 659 7468 | Other | Valley Springs · Calaveras County | — | — |
| Amestoy Construction | James Michael Amestoy | — | (209) 483 4855 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Amtuca Overhead Garage Doors | Amtuca Overhead Garage Doors | — | (209) 268 6347 | Other | San Andreas · Calaveras County | — | — |