| A & S Plumbing INC | Armando Salinas | — | (707) 696 9284 | Other | Napa · Napa County | — | — |
| A C Fence | A C Fence | — | (707) 738 4769 | Other | American Canyon · Napa County | — | — |
| A T S | Peter Francis Murphy | — | (707) 337 3190 | Other | Napa · Napa County | — | — |
| A V E | Brian Lee Weston | — | (707) 253 7703 | Other | Napa · Napa County | — | — |
| A+ Waterworks INC | Nasser Zaid Nijem | — | (707) 249 8987 | Other | American Canyon · Napa County | — | — |
| A1 Welding Services | Adam Daniel Aitchison | — | (707) 373 0096 | Other | American Canyon · Napa County | — | — |
| Aaa Organized Plumbing Napa | Michael Joseph Jennaro | — | (209) 601 0734 | Other | Napa · Napa County | — | — |
| Abc Sewer Solutions | Abc Sewer Solutions | — | (707) 226 3166 | Other | Napa · Napa County | — | — |
| Ace Concrete & Sons | Ace Concrete & Sons | — | (707) 927 5427 | Other | Napa · Napa County | — | — |
| Acme Engineering Incorporated DBA Acme Pump And Water Service | Jon Michael Terry | — | (707) 253 2263 | Other | Napa · Napa County | — | — |
| Adrian Arias Custom Tile Stone | Adrian Arias Custom Tile Stone | — | (707) 815 8029 | Other | Napa · Napa County | — | — |
| All Style Tile | All Style Tile | — | (707) 227 5500 | Other | Napa · Napa County | — | — |
| Allweld Metal Fabrication INC | Matthew Joseph Petrini | — | (707) 252 7875 | Other | Napa · Napa County | — | — |
| Anthony's Plumbing Of Napa | Anthony's Plumbing Of Napa | — | (707) 815 2567 | Other | Napa · Napa County | — | — |
| Atlas Peak Construction | Daniel Hugh Iii Mc Lean | — | (707) 254 0751 | Other | Napa · Napa County | — | — |
| Av Plumbing | Av Plumbing | — | (707) 758 6390 | Other | Napa · Napa County | — | — |
| Avelar Hardwood Floors | Avelar Hardwood Floors | — | (707) 252 4946 | Other | Napa · Napa County | — | — |
| Banda Iron Works | Banda Iron Works | — | (707) 224 4457 | Other | Napa · Napa County | — | — |
| Bart Drescher DBA Dp Pipe Works Plumbing | Dp Pipe Works Plumbing | — | (707) 815 2974 | Other | Napa · Napa County | — | — |
| Basford's General Engineering | Basford's General Engineering | — | (707) 337 7858 | Other | Napa · Napa County | — | — |
| Beautiful Again Stone & Tile INC | Genaro Castro Bautista | — | (707) 310 7009 | Other | Napa · Napa County | — | — |
| Benchmark Civil Construction INC | Joel Charles Gentry | joel@benchmarkcivilconstruction.com | (707) 254 8705 | Other | Napa · Napa County | — | — |
| Benchmark Home Elevator INC | Scott Patrick Britton | — | (707) 255 4687 | Other | Napa · Napa County | — | — |
| Benson Company INC | Daren Russell Benson | — | (707) 486 8605 | Other | Deer Park · Napa County | — | — |
| Bill Johnson Plumbing Co | William Joseph Johnson | — | (415) 505 6747 | Other | American Canyon · Napa County | — | — |
| Binstock Enterprises | Dennis Ray Binstock | — | (707) 255 6172 | Other | Napa · Napa County | — | — |
| Bisso Drywall | Bisso Drywall | — | (707) 225 1948 | Other | Napa · Napa County | — | — |
| Blackney And Marsh Floors INC | Andrew Robert-Sidne Curry | — | (707) 226 7831 | Other | Napa · Napa County | — | — |
| Blakeley Construction INC | Kelly Rae Blakeley | — | (707) 942 9286 | Other | Calistoga · Napa County | — | — |
| Blue Star Flooring | Vincent Boquslaw Zielinski | — | (925) 389 0442 | Other | St Helena · Napa County | — | — |
| Bonilla Plastering | Bonilla Plastering | — | (707) 287 6215 | Other | Napa · Napa County | — | — |
| Boyadjieff Construction INC | Casey Leroy Boyadjieff | — | (707) 942 4829 | Other | Calistoga · Napa County | — | — |
| Brad Pursell General Engineering INC | Bradley Jack Pursell | — | (707) 738 7608 | Other | Napa · Napa County | — | — |
| Broc Stober Drapery Installations | Broc Stober Drapery Installations | — | (707) 287 7822 | Other | Napa · Napa County | — | — |
| Broyles Floor Covering | Broyles Floor Covering | — | (707) 967 0292 | Other | Napa · Napa County | — | — |
| Buckingham Stairways | Buckingham Stairways | — | (707) 227 7653 | Other | Napa · Napa County | — | — |
| Bud's Metal Designs | Bud's Metal Designs | — | (707) 529 9422 | Other | Calistoga · Napa County | — | — |
| California Stonecraft | California Stonecraft | info@californiastonecraft.com | (707) 252 4496 | Other | Napa · Napa County | — | — |
| Calixto General Engineering | Cordoba Rodrigo Calixto | — | (707) 235 3036 | Other | Yountville · Napa County | — | — |
| Carl Frederick Shellhorn DBA Carl's Welding & Repair Service | Carl Frederick Shellhorn | — | (707) 695 9722 | Other | Napa · Napa County | — | — |