- Baby & Childrens Gifts & Accessories, Sayville
- Baby Stores, Sayville - Baby Accessories & Clothes
- Backflow Prevention Devices & Services, Sayville
- Bagels, Sayville
- Bakeries, Sayville
- Bank Supplies & Equipment, Sayville
- Banking Attorneys & Lawyers, Sayville
- Banking Attorneys & Lawyers, Sayville
- Banking Lawyers & Attorneys, Sayville
- Bankruptcy Services, Sayville
- Banks, Sayville
- Barber Shops, Sayville
- Barbers, Sayville
- Bars, Sayville
- Bars & Grills, Sayville
- Bathroom Remodeling, Sayville - Bathroom Remodel & Planning Services
- Beauty Salons, Sayville
- Bedroom Furniture Stores, Sayville - Master & Kids Bedroom Furniture Sets & Beds
- Beer Taverns, Sayville
- Beverage Stores, Sayville
- Bicycle Rentals, Sayville - Bike Rental
- Bicycle Repair & Service, Sayville - Bike Repair Shops
- Bird Cages & Accessories, Sayville
- Birds, Sayville
- Birds & Bird Supplies , Sayville
- Bistros, Sayville
- Board Of Education, Sayville
- Board Up Services Contractors, Sayville
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- Boat Covers, Tops & Upholstery, Sayville
- Boat Services, Sayville
- Boat Storage , Sayville - Equipment & Services
- Boat, Yacht & Sail Boat Transport, Sayville
- Boats & Yachts, Sayville - Yachts, Sailboats & Boats for Sale
- Bonds, Sayville
- Bookkeeping Services Licensed, Sayville
- Bookkeeping Systems & Services, Sayville
- Books, Magazines & Newspapers Stores, Sayville - Bookstores
- Boutiques & Boutique Items, Sayville
- Bowling Centers, Sayville
- Brake Service & Repair, Sayville - Brake Pads
- Breakfast Restaurants, Sayville
- Builders & Contractors, Sayville
- Builders & Contractors - More, Sayville
- Building Construction Consultants, Sayville - Construction Management & Consulting
- Building Materials, Sayville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Sayville
- Burglar Alarm Systems, Sayville
- Business & Professional Associations, Sayville
- Business & Trade Organizations, Sayville
- Business Communication Consultants, Sayville
- Business Insurance, Sayville
- Business Legal Services, Sayville
- Business Machines Repair, Sayville
- Business Management Consultants, Sayville
- Business Services, Sayville
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