- Baby & Childrens Gifts & Accessories, Amagansett
- Bakeries, Amagansett
- Banking Attorneys & Lawyers, Amagansett
- Banks, Amagansett
- Baptist Churches, Amagansett
- Barber Shops, Amagansett
- Barbers, Amagansett
- Bars, Amagansett
- Bars & Grills, Amagansett
- Beach & Water Related Services, Amagansett
- Beauty Salons, Amagansett
- Bed & Breakfast, Amagansett
- Bedroom Furniture Stores, Amagansett - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Amagansett
- Beer Taverns, Amagansett
- Bicycle Parts & Accessories, Amagansett
- Bicycle Shops, Amagansett - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Birth Control & Family Planning Clinics, Amagansett
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- Boating & Swimming Clubs, Amagansett
- Boats & Yachts, Amagansett - Yachts, Sailboats & Boats for Sale
- Book Stores, Amagansett
- Books, Magazines & Newspapers Stores, Amagansett - Bookstores
- Boutiques & Boutique Items, Amagansett
- Brake Service & Repair, Amagansett - Brake Pads
- Brick Masonry & Bricklayer Contractors, Amagansett - Brick Mason - Install & Repair
- Builders & Contractors, Amagansett
- Builders & Contractors - More, Amagansett
- Building & Property Maintenance & Services, Amagansett
- Building Materials & Supplies, Amagansett
- Building Restoration & Preservation, Amagansett
- Building Site Preparation Contractors, Amagansett - Land Preparation & Land Clearing
- Burglar Alarm Systems, Amagansett
- Business Legal Services, Amagansett
- Business Management Consultants, Amagansett
- Business Services, Amagansett
- Business, Vocational & Technical, Amagansett
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