- Baby Stores, East Setauket - Baby Accessories & Clothes
- Bagels, East Setauket
- Bakeries, East Setauket
- Banks, East Setauket
- Banners, Flags, Pennants, Decals, Posters & Signs, East Setauket
- Banners, Pennants & Flags, East Setauket
- Barbers, East Setauket
- Bars & Grills, East Setauket
- Basement Waterproofing - Waterproofing Contractors, East Setauket - Foundation & Concrete Waterproofing
- Bathroom Remodeling, East Setauket - Bathroom Remodel & Planning Services
- Battery, East Setauket - Retail Batteries Stores
- Battery Supplies, East Setauket
- Beauty Consultants, East Setauket
- Beauty Salons, East Setauket
- Beverage Stores, East Setauket
- Boat Services, East Setauket
- Boats & Yachts, East Setauket - Yachts, Sailboats & Boats for Sale
- Bonds, East Setauket
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- Book Publishers, East Setauket - Book Printing & Publishing
- Bricks, Blocks & Stone Products, East Setauket - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, East Setauket
- Builders & Contractors - More, East Setauket
- Builders Hardware Stores, East Setauket
- Building & Home Inspection, East Setauket - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, East Setauket
- Building Materials & Supplies, East Setauket
- Building Site Preparation Contractors, East Setauket - Land Preparation & Land Clearing
- Burglar Alarm Systems, East Setauket
- Bus Lines, East Setauket - Bus Transportation
- Business & Professional Associations, East Setauket
- Business Insurance, East Setauket
- Business Legal Services, East Setauket
- Business Management Consultants, East Setauket
- Business Services, East Setauket
- Business Wholesale, East Setauket
- Business, Vocational & Technical, East Setauket
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