- Bagel Restaurants, East Northport
- Bagels, East Northport
- Bakeries, East Northport
- Balloons & Helium, East Northport
- Ballroom Dance Hall, East Northport
- Banks, East Northport
- Baptist Churches, East Northport
- Barber Shops, East Northport
- Barbers, East Northport
- Bars, East Northport
- Bars & Grills, East Northport
- Baseball & Softball Clubs, East Northport
- Baseball Cards & Sports Memorabilia, East Northport
- Basement Waterproofing - Waterproofing Contractors, East Northport - Foundation & Concrete Waterproofing
- Beauty Salons, East Northport
- Beer & Wine Stores, East Northport
- Beer Taverns, East Northport
- Beverage Stores, East Northport
- Bible Church, East Northport
- Bicycle Parts & Accessories, East Northport
- Bicycle Rentals, East Northport - Bike Rental
- Bicycle Repair & Service, East Northport - Bike Repair Shops
- Bicycle Shops, East Northport - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Board Of Education, East Northport
- Boats & Yachts, East Northport - Yachts, Sailboats & Boats for Sale
- Boiler & Furnace Contractors, East Northport - Installation, Cleaning & Repair Services
- Boiler - New & Used, East Northport - Radiant Heating
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- Book Stores, East Northport
- Books, Magazines & Newspapers Stores, East Northport - Bookstores
- Bowling Centers, East Northport
- Boxing Clubs & Instruction, East Northport
- Brake Service & Repair, East Northport - Brake Pads
- Breakfast Restaurants, East Northport
- Brick Masonry & Bricklayer Contractors, East Northport - Brick Mason - Install & Repair
- Builders & Contractors, East Northport
- Builders & Contractors - More, East Northport
- Building & Home Inspection, East Northport - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, East Northport - Construction Management & Consulting
- Building Hardware & Materials, East Northport
- Building Materials, East Northport - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, East Northport
- Building Materials, Glass, East Northport
- Burglar Alarm Systems, East Northport
- Bus Lines, East Northport - Bus Transportation
- Bus Lines Ticket Agencies, East Northport
- Bus Rental & Charter Bus Service, East Northport
- Business & Professional Associations, East Northport
- Business Brokers, East Northport
- Business Insurance, East Northport
- Business Legal Services, East Northport
- Business Management Consultants, East Northport
- Business Services, East Northport
- Business, Vocational & Technical, East Northport
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