- Baby & Childrens Gifts & Accessories, Northport
- Bagels, Northport
- Bakeries, Northport
- Banks, Northport
- Banquet Halls, Reception Halls & Party Facilities, Northport
- Barber Shop & Beauty Salon Supplies & Equipment, Northport - Beauty & Barber Supplies
- Barber Shops, Northport
- Barbers, Northport
- Bars, Northport
- Bars & Grills, Northport
- Bathroom Remodeling, Northport - Bathroom Remodel & Planning Services
- Beauty Salons, Northport
- Beer & Wine Stores, Northport
- Beverage Stores, Northport
- Beverages, Northport
- Biotechnology, Northport
- Bistros, Northport
- Board Of Education, Northport
- Boat Services, Northport
- Boat Storage , Northport - Equipment & Services
- Boating & Swimming Clubs, Northport
- Boats & Yachts, Northport - Yachts, Sailboats & Boats for Sale
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- Boiler - New & Used, Northport - Radiant Heating
- Bonds, Northport
- Book Publishers, Northport - Book Printing & Publishing
- Boutiques & Boutique Items, Northport
- Brake Service & Repair, Northport - Brake Pads
- Breakfast Restaurants, Northport
- Brick Masonry & Bricklayer Contractors, Northport - Brick Mason - Install & Repair
- Builders & Contractors, Northport
- Builders & Contractors - More, Northport
- Builders Hardware Stores, Northport
- Building & Home Inspection, Northport - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Northport - Construction Management & Consulting
- Building Materials, Northport - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Northport
- Building Site Preparation Contractors, Northport - Land Preparation & Land Clearing
- Burglar Alarm Systems, Northport
- Business & Professional Associations, Northport
- Business & Trade Organizations, Northport
- Business Insurance, Northport
- Business Legal Services, Northport
- Business Management Consultants, Northport
- Business Services, Northport
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