- Bagels, Southold
- Bakeries, Southold
- Banks, Southold
- Baptist Churches, Southold
- Barber Shops, Southold
- Barbers, Southold
- Bars, Southold
- Bars & Grills, Southold
- Bathing Accessories, Southold
- Bathroom Accessories & Fixtures, Southold - Bath Accessories, Vanity & Mirrors
- Beauty Salons, Southold
- Bed & Breakfast, Southold
- Beer & Wine Stores, Southold
- Beer Taverns, Southold
- Beverage Stores, Southold
- Blueprint Service, Southold - Blueprinting Services
- Boat Services, Southold
- Boat Storage , Southold - Equipment & Services
- Boat Trailers, Southold
- Boating & Swimming Clubs, Southold
- Boats & Yachts, Southold - Yachts, Sailboats & Boats for Sale
- Boiler - New & Used, Southold - Radiant Heating
- Boiler Repair & Cleaning, Southold
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- Book Publishers, Southold - Book Printing & Publishing
- Bottled Gas, Lp Gas & Propane Dealers, Southold
- Brake Service & Repair, Southold - Brake Pads
- Breakfast Restaurants, Southold
- Brick Masonry & Bricklayer Contractors, Southold - Brick Mason - Install & Repair
- Builders & Contractors, Southold
- Builders & Contractors - More, Southold
- Builders Hardware Stores, Southold
- Building & Home Inspection, Southold - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Southold
- Building Construction Consultants, Southold - Construction Management & Consulting
- Building Materials, Southold - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Southold
- Building Restoration & Preservation, Southold
- Building Site Preparation Contractors, Southold - Land Preparation & Land Clearing
- Burglar Alarm Systems, Southold
- Business & Professional Associations, Southold
- Business Brokers, Southold
- Business Insurance, Southold
- Business Legal Services, Southold
- Business Management Consultants, Southold
- Business Services, Southold
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