- Bakeries, Port Jefferson
- Bank Auditing & Consulting, Port Jefferson
- Bankruptcy Attorneys & Lawyers, Port Jefferson
- Bankruptcy Attorneys & Lawyers, Port Jefferson
- Bankruptcy Lawyers & Attorneys, Port Jefferson
- Banks, Port Jefferson
- Barbers, Port Jefferson
- Bars, Port Jefferson
- Bars & Grills, Port Jefferson
- Bathroom Fixtures, Port Jefferson - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Battery, Port Jefferson - Retail Batteries Stores
- Battery Storage, Port Jefferson
- Beauty Salons, Port Jefferson
- Bed & Breakfast, Port Jefferson
- Beer & Wine Stores, Port Jefferson
- Beer Taverns, Port Jefferson
- Beverage Stores, Port Jefferson
- Bistros, Port Jefferson
- Boating & Swimming Clubs, Port Jefferson
- Boats & Yachts, Port Jefferson - Yachts, Sailboats & Boats for Sale
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- Bonds, Port Jefferson
- Book Stores, Port Jefferson
- Books, Magazines & Newspapers Stores, Port Jefferson - Bookstores
- Boutiques & Boutique Items, Port Jefferson
- Breakfast Restaurants, Port Jefferson
- Brick Masonry & Bricklayer Contractors, Port Jefferson - Brick Mason - Install & Repair
- Builders & Contractors, Port Jefferson
- Builders & Contractors - More, Port Jefferson
- Building Construction Consultants, Port Jefferson - Construction Management & Consulting
- Building Materials, Port Jefferson - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Port Jefferson
- Burglar Alarm Systems, Port Jefferson
- Business & Professional Associations, Port Jefferson
- Business & Trade Organizations, Port Jefferson
- Business Insurance, Port Jefferson
- Business Legal Services, Port Jefferson
- Business Management Consultants, Port Jefferson
- Business Services, Port Jefferson
- Business, Vocational & Technical, Port Jefferson
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