| Biagi Bros INC | 433123 | 149 | 149 | Interstate |
| Napa Valley Tours & Transportation | 2751645 | 75 | 70 | Interstate |
| Evans Airporter | 800912 | 57 | 45 | Interstate |
| Napa County Office Of Education | 2808646 | 54 | 35 | Intrastate |
| Complete Welders Supply | 2728784 | 47 | 17 | IntrastateHazmat |
| Atlas Vineyard Management LLC | 3184629 | 45 | 39 | Interstate |
| Napa Recycling & Waste Services LLC | 2749171 | 40 | 42 | Intrastate |
| Bianco Winegrowing | 3108255 | 40 | 23 | Intrastate |
| Theoni INC | 2840426 | 33 | 30 | Interstate |
| Napa Valley Aloft INC | 2768403 | 31 | 16 | Intrastate |
| Platypus Tours | 4457026 | 30 | 32 | Interstate |
| True Elegance Limousine | 2717832 | 23 | 14 | Intrastate |
| City Of Napa | 2810064 | 23 | 40 | Intrastate |
| Barbour Vineyards Management LLC | 3621645 | 19 | 19 | Intrastate |
| Napa County Fire Department | 2810705 | 18 | 47 | Intrastate |
| Modern Method Roofing CO INC | 2658122 | 17 | 17 | Intrastate |
| Da Ve Winery | 2617807 | 16 | 10 | Intrastate |
| Balloons Above The Valley | 2710194 | 16 | 12 | Intrastate |
| Heritage Vineyard Management | 2772824 | 13 | 3 | Intrastate |
| Price Landscape Services, Inc. | 8576650 | 13 | 1 | Intrastate |
| Royal Coach Service | 1840959 | 12 | 9 | Interstate |
| Nova Group INC | 1955454 | 12 | 12 | Interstate |
| Clerici Landscape Management LLC | 2648712 | 12 | 12 | Intrastate |
| Alta Luxury Transportation Services | 2807262 | 12 | 6 | Intrastate |
| Syar Industries INC | 3126290 | 12 | 11 | IntrastateHazmat |
| Huckfeldt Well Drilling INC | 2623392 | 11 | 8 | Intrastate |
| The Hess Collection Winery | 2669484 | 11 | 16 | Intrastate |
| Northern Pacific Corporation | 2680018 | 11 | 5 | Intrastate |
| Crown Hill Stone Supply LLC | 2710385 | 11 | 7 | Intrastate |
| Walsh Vineyards Management INC | 2743169 | 11 | 12 | Intrastate |
| Cameron Electric | 2710217 | 10 | 10 | Intrastate |
| Ken Mays Plumbing INC | 3119899 | 10 | 8 | Intrastate |
| Pauls Trucking | 266489 | 9 | 8 | Intrastate |
| Beaulieu Vineyard | 2662865 | 9 | 10 | Intrastate |
| Vyborny Vineyard Management INC | 2668835 | 9 | 6 | Intrastate |
| Silverado Farming Company | 2742871 | 9 | 8 | Intrastate |
| Red Madrone LLC | 4167881 | 9 | 10 | Intrastate |
| Avcon Constructors INC | 2549356 | 8 | 4 | Intrastate |
| Oakville Pump Service INC | 3242398 | 8 | 16 | Intrastate |
| Justin-Siena High School Corporation | 2604691 | 7 | 7 | Intrastate |
| Wsc | 2659558 | 7 | 2 | Interstate |
| A N S Plumbing INC | 2712403 | 7 | 5 | Intrastate |
| Collabria Care | 2729336 | 7 | 6 | Intrastate |
| Jcn Xpress LLC | 3009668 | 7 | 6 | Intrastate |
| Destination Napa Valley | 3397289 | 7 | 3 | Intrastate |
| The Meadows Of Napa Valley | 8138074 | 7 | 3 | Intrastate |
| Hopewell Baptist Church | 2661036 | 6 | 5 | Intrastate |
| Bazan Vineyard Management LLC | 2699615 | 6 | 10 | Intrastate |
| Napa Valley Balloons INC | 2739929 | 6 | 5 | Intrastate |
| Juan Fuentes DBA Victoria Vineyards Management | 3563408 | 6 | 2 | Intrastate |
| Ace Concrete And Sons | 4191166 | 6 | 2 | Intrastate |
| Johnston General Engineering | 4460447 | 6 | 6 | IntrastateHazmat |
| Del Bondio Farming | 1828641 | 5 | 5 | Interstate |
| Turner Moving & Storage | 1919262 | 5 | 2 | Intrastate |
| Berryesa Garbage Service INC | 2656470 | 5 | 4 | Intrastate |
| Napa Sanitation District | 2668900 | 5 | 25 | Intrastate |
| Napa Valley Wine Train | 2671342 | 5 | 1 | Intrastate |
| 600 Tower Road Operations LLC | 2705711 | 5 | 6 | Intrastate |
| Pina Vineyard Management LLC | 2750090 | 5 | 5 | Intrastate |
| Bayview Vineyards Corporation | 2849874 | 5 | 5 | Intrastate |
| Guillermo Espinoza Trucking INC | 2890737 | 5 | 4 | Intrastate |
| Top Choice Trucking | 2914972 | 5 | 1 | Intrastate |
| Elegant Wine Tours LLC | 3124627 | 5 | 13 | Intrastate |
| Noble Wine Tours | 3146724 | 5 | 5 | Intrastate |
| M3 General Engineering INC | 3178334 | 5 | 2 | Intrastate |
| Jg Masonry LLC | 3381975 | 5 | 3 | Intrastate |
| Aztech Pool Plastering INC | 3854712 | 5 | 12 | Intrastate |
| John Anthony Truchard | 3875246 | 5 | 3 | Intrastate |
| Triton Truck Repair INC | 3916586 | 5 | 5 | IntrastateHazmat |
| Pearls Farm Labor INC | 4023174 | 5 | 5 | Intrastate |
| Cultivar | 4092860 | 5 | 2 | Intrastate |
| K&s Asphalt Sealing Solutions | 4232173 | 5 | 20 | Intrastate |
| Rion Designs | 2599615 | 4 | 6 | Intrastate |
| Van Windens Nursery LLC | 2610455 | 4 | 4 | Intrastate |
| Binstock Enterprises | 2626715 | 4 | 1 | Intrastate |
| Napa Winery Shuttle, LLC | 2655742 | 4 | 5 | Intrastate |
| Silverado Transport INC | 2661659 | 4 | 5 | Intrastate |
| Robledo Vineyard Management | 2663821 | 4 | 6 | Intrastate |
| Regusci Vineyard Management INC | 2671577 | 4 | 4 | Intrastate |
| Denise Gale | 2698471 | 4 | 3 | Intrastate |
| The Meadows Of Napa Valley | 2733071 | 4 | 3 | Intrastate |
| Waste Abatement Resources INC | 2751988 | 4 | 3 | Intrastate |
| Napa Select Vineyard Services | 2760105 | 4 | 2 | Intrastate |
| The Meritage Resort LLC | 2804190 | 4 | 2 | Intrastate |
| Vinedresser Vineyard Management INC | 2986274 | 4 | 8 | Intrastate |
| Allweld Metal Fabrication INC | 3161690 | 4 | 6 | Intrastate |
| Luis Concrete Pumping INC | 3351572 | 4 | 3 | Intrastate |
| Napa Valley G Experience LLC | 3378390 | 4 | 4 | Intrastate |
| Ecoplu INC | 3557919 | 4 | 4 | Intrastate |
| Keystone Yards | 4429708 | 4 | 3 | Intrastate |
| Jason Hall Construction, Inc. | 8424615 | 4 | 4 | Intrastate |
| Piner's Welding Supply | 8710353 | 4 | 4 | IntrastateHazmat |
| Kariotis Trucking | 725733 | 3 | 3 | Interstate |
| Gorilla Tree Service | 2646802 | 3 | 3 | Intrastate |
| Ryan Mcgee Bottling | 2648929 | 3 | 3 | Intrastate |
| Peck & Hiller Company | 2650498 | 3 | 3 | Intrastate |
| Nick-O & Sons | 2652788 | 3 | 1 | IntrastateHazmat |
| Jake Wheeler Trucking | 2656404 | 3 | 1 | Intrastate |
| Elite Limousine Service | 2674327 | 3 | 2 | Intrastate |
| Magnum Tours | 2678410 | 3 | 4 | Intrastate |