- Baby & Childrens Gifts & Accessories, Port Washington
- Bagels, Port Washington
- Bakeries, Port Washington
- Balloons & Helium, Port Washington
- Bank Supplies & Equipment, Port Washington
- Banks, Port Washington
- Banners, Flags, Pennants, Decals, Posters & Signs, Port Washington
- Baptist Churches, Port Washington
- Barbecue Grills & Supplies, Port Washington
- Barbecue Restaurants, Port Washington
- Barber Shops, Port Washington
- Barbers, Port Washington
- Bars, Port Washington
- Bars & Grills, Port Washington
- Basement Waterproofing - Waterproofing Contractors, Port Washington - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Port Washington - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Port Washington - Bathroom Remodel & Planning Services
- Battery Stores, Port Washington
- Bearings, Port Washington
- Beauty Consultants, Port Washington
- Beauty Salons, Port Washington
- Bedroom Furniture Stores, Port Washington - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Port Washington
- Bereavement Services, Port Washington
- Beverage Stores, Port Washington
- Bible Church, Port Washington
- Bicycle Rentals, Port Washington - Bike Rental
- Bicycle Repair & Service, Port Washington - Bike Repair Shops
- Billing Services, Port Washington
- Biological Research, Port Washington - Biological Labs
- Biotechnology Products & Services, Port Washington
- Bistros, Port Washington
- Boat & Yacht Charter, Port Washington
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- Boat Covers, Tops & Upholstery, Port Washington
- Boat Motors & Marine Equipment Dealers, Port Washington
- Boat Services, Port Washington
- Boat Storage , Port Washington - Equipment & Services
- Boating & Swimming Clubs, Port Washington
- Boating Instruction, Port Washington
- Boats & Yachts, Port Washington - Yachts, Sailboats & Boats for Sale
- Book Publishers, Port Washington - Book Printing & Publishing
- Books, Magazines & Newspapers Stores, Port Washington - Bookstores
- Boutiques & Boutique Items, Port Washington
- Breakfast Restaurants, Port Washington
- Brick Masonry & Bricklayer Contractors, Port Washington - Brick Mason - Install & Repair
- Brooms & Brushes Manufacturers, Port Washington
- Builders & Contractors, Port Washington
- Builders & Contractors - More, Port Washington
- Builders Hardware Stores, Port Washington
- Building & Home Inspection, Port Washington - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Port Washington - Construction Management & Consulting
- Building Design & Construction Consultants, Port Washington
- Building Hardware & Materials, Port Washington
- Building Materials, Port Washington - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Port Washington
- Building Site Preparation Contractors, Port Washington - Land Preparation & Land Clearing
- Burglar Alarm Systems, Port Washington
- Bus & Other Large Specialty Vehicle Manufacturers, Port Washington
- Business & Professional Associations, Port Washington
- Business Brokers, Port Washington
- Business Forms, Systems & Supplies, Port Washington
- Business Insurance, Port Washington
- Business Legal Services, Port Washington
- Business Management Consultants, Port Washington
- Business Services, Port Washington
- Business, Vocational & Technical, Port Washington
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