| 123 - Floor INC | William Brent Powell | — | (415) 485 1230 | Other | San Rafael · Marin County | — | — |
| 5 Star Via All Star Fire Protection | Zebarjadi Farhad | — | (415) 596 0410 | Other | Novato · Marin County | — | — |
| 777 Plumbing INC | Jorge Sanchez | — | (415) 847 5995 | Other | Greenbrae · Marin County | — | — |
| A C L Plumbing & Service | Jose Alejandro Castillo Lugo | — | (415) 209 4544 | Other | Novato · Marin County | — | — |
| A Complete Drywall Company | Michael Blake Mayock | — | (415) 456 9306 | Other | San Rafael · Marin County | — | — |
| A Fix Construction | Darren Patrick Fix | — | (707) 228 0785 | Other | Novato · Marin County | — | — |
| A Shield Advanced Protection | A Shield Advanced Protection | — | (415) 238 7804 | Other | Novato · Marin County | — | — |
| A V Custum Cabinetry | A V Custum Cabinetry | — | (415) 827 4618 | Other | Novato · Marin County | — | — |
| A1 Abatement Group INC | Norman Ronald Bautista | — | (415) 479 0600 | Other | San Rafael · Marin County | — | — |
| A1a Garage Door Service And Installation | Colin Alexander Thomas | — | (408) 205 5251 | Other | Novato · Marin County | — | — |
| Above The Rest Fencing INC | Matthew Mc Ivor Olyphant | — | (415) 785 8396 | Other | San Rafael · Marin County | — | — |
| Abracadabra Plumbing Rooter | Abracadabra Plumbing Rooter | — | (415) 990 6178 | Other | San Rafael · Marin County | — | — |
| Agile Railing | John Peter Gazzola | info@agilerailing.com | (415) 827 8200 | Other | Mill Valley · Marin County | — | — |
| Alvarez Marble & Tile | Alvarez Marble & Tile | — | (415) 408 8957 | Other | San Rafael · Marin County | — | — |
| Amesos Plumbing INC | Sean Christopher Wiles | sean@amesosplumbing.com | (415) 457 6363 | Other | San Rafael · Marin County | — | — |
| Ammons Backflow Certified Testing INC | David Hoke Ammons | — | (415) 712 4863 | Other | San Rafael · Marin County | — | — |
| Andrew Ong | Andrew Ong | — | (415) 301 8796 | Other | Novato · Marin County | — | — |
| Andrew Pino's Plumbing | Andrew Pino's Plumbing | — | (415) 578 8718 | Other | San Rafael · Marin County | — | — |
| Anthony J Kenney Tile Co | Anthony Joseph Kenney | — | (415) 246 1077 | Other | Novato · Marin County | — | — |
| Ar Plumbing INC | Ludwing Haroldo Vasquez Velasquez | — | (415) 459 1214 | Other | San Rafael · Marin County | — | — |
| Architectural Design Carpets | Debra Lynn Duering | — | (415) 458 1717 | Other | San Rafael · Marin County | — | — |
| Architectural Sheet Metal Corporation | William Wayne Kolthoff | — | (415) 789 7900 | Other | Tiburon · Marin County | — | — |
| Arctyp Metal Arts | Arctyp Metal Arts | — | (415) 577 8885 | Other | Tiburon · Marin County | — | — |
| Ardito Construction | Ralph Silvio Ardito | — | (707) 953 9602 | Other | San Anselmo · Marin County | — | — |
| Arka Plumbing | Arka Plumbing | — | (415) 516 0214 | Other | San Rafael · Marin County | — | — |
| Artisan Plumbing INC | Thomas Russell Seitz | — | (415) 482 8707 | Other | Fairfax · Marin County | — | — |
| Asap Demolition | Leandro Righi Duarte | — | (510) 453 9856 | Other | Tiburon · Marin County | — | — |
| Associated Electronics Gates | Associated Electronics Gates | — | (415) 454 2936 | Other | Tomales · Marin County | — | — |
| Atlantis Interiors | Dan Watson | — | (415) 332 6500 | Other | Sausalito · Marin County | — | — |
| Aurora Cabinets And Countertops INC | Martin John Keith | — | (415) 472 4171 | Other | San Rafael · Marin County | — | — |
| Automatic Garage Door Of Marin INC | Anthony Gail Egland | — | (415) 883 0725 | Other | Novato · Marin County | — | — |
| Avery Stewart Concrete INC | Avery Logan Stewart | — | (707) 623 0374 | Other | Novato · Marin County | — | — |
| Baker Plumbing & Company | Clint Mausisa Baker | — | (510) 932 0227 | Other | Novato · Marin County | — | — |
| Bananas At Large INC | Alan Scott Rosen | — | (415) 457 7600 | Other | San Rafael · Marin County | — | — |
| Barrios Drywall INC | Edras Ageo Barrios Cruz | — | (415) 235 9152 | Other | San Rafael · Marin County | — | — |
| Baswell Plumbing | Baswell Plumbing | baswellplumbing@gmail.com | (415) 897 7977 | Other | Novato · Marin County | — | — |
| Bay Area Moisture Control By Restorex INC | Christopher Alan King | — | (415) 884 0500 | Other | Novato · Marin County | — | — |
| Bay Area Wifi And Networks | Ari-Jon Pratt Laquidara | — | (415) 879 8647 | Other | San Rafael · Marin County | — | — |
| Bay Pacific Pipeline Incorporated | Kevin Anthony Carew | — | (415) 897 6958 | Other | Novato · Marin County | — | — |
| Bay Ridge Plumbing INC | Ben Andre | — | (415) 672 0390 | Other | San Rafael · Marin County | — | — |