- Bakeries, Yountville
- Balloons Hot & Cold Air, Yountville
- Banks, Yountville
- Banquet Halls, Reception Halls & Party Facilities, Yountville
- Bars, Yountville
- Bars & Grills, Yountville
- Beauty Salons, Yountville
- Bed & Breakfast, Yountville
- Bedding & Linens Stores, Yountville - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Beer & Wine Stores, Yountville
- Beer Taverns, Yountville
- Bicycle Rentals, Yountville - Bike Rental
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- Bird Repellent, Barrier & Control, Yountville
- Bistros, Yountville
- Boutiques & Boutique Items, Yountville
- Breakfast Restaurants, Yountville
- Builders & Contractors, Yountville
- Builders & Contractors - More, Yountville
- Building Materials & Supplies, Yountville
- Burglar Alarm Systems, Yountville
- Business & Professional Associations, Yountville
- Business Legal Services, Yountville
- Business Services, Yountville
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