- Bagels, Hauppauge
- Bakeries, Hauppauge
- Balloons - Novelty, Toy & Decorative, Hauppauge
- Bank Auditing & Consulting, Hauppauge
- Banks, Hauppauge
- Banners, Flags, Pennants, Decals, Posters & Signs, Hauppauge
- Barber Shops, Hauppauge
- Barbers, Hauppauge
- Bars, Hauppauge
- Bars & Grills, Hauppauge
- Baseball & Softball Batting Ranges, Hauppauge
- Bath Equipment & Supplies, Hauppauge
- Baton Twirling Schools, Hauppauge
- Bearings, Hauppauge
- Beauty Salons, Hauppauge
- Bedding & Linens Stores, Hauppauge - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, Hauppauge - Master & Kids Bedroom Furniture Sets & Beds
- Beer Taverns, Hauppauge
- Belting & Belting Supplies Wholesale, Hauppauge
- Belting Supplies & Equipment, Hauppauge
- Beverage & Juice Bottlers Manufacturers, Hauppauge
- Beverage Alcoholic, Hauppauge
- Beverage Non-Alcoholic Manufacturers, Hauppauge
- Beverage Stores, Hauppauge
- Beverages, Hauppauge
- Bible Church, Hauppauge
- Bicycle Parts & Accessories, Hauppauge
- Bicycle Shops, Hauppauge - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Biological Research, Hauppauge - Biological Labs
- Biotechnology Products & Services, Hauppauge
- Blue Printing Dispensing Supplies & Equipment, Hauppauge
- Boats & Yachts, Hauppauge - Yachts, Sailboats & Boats for Sale
- Bonds Surety & Fidelity, Hauppauge
- Book Binders & Folders, Hauppauge - Office Supplies
- Book Publishers, Hauppauge - Book Printing & Publishing
- Book Stores, Hauppauge
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- Bottle Dealers, Hauppauge
- Bottlers Equipment & Supplies, Hauppauge
- Bottling Manufacturing, Hauppauge
- Boutiques & Boutique Items, Hauppauge
- Breakfast Restaurants, Hauppauge
- Brick Masonry & Bricklayer Contractors, Hauppauge - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Hauppauge - Companies, Wholesale, Manufacturers & Suppliers
- Brooms & Brushes Manufacturers, Hauppauge
- Builders & Contractors, Hauppauge
- Builders & Contractors - More, Hauppauge
- Builders Hardware Stores, Hauppauge
- Building & Home Inspection, Hauppauge - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Hauppauge
- Building Construction Consultants, Hauppauge - Construction Management & Consulting
- Building Design & Construction Consultants, Hauppauge
- Building Equipment Installation Contractors, Hauppauge
- Building Hardware & Materials, Hauppauge
- Building Materials, Hauppauge - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Hauppauge
- Building Site Preparation Contractors, Hauppauge - Land Preparation & Land Clearing
- Burglar Alarm Systems, Hauppauge
- Bus Rental & Charter Bus Service, Hauppauge
- Business & Professional Associations, Hauppauge
- Business & Trade Organizations, Hauppauge
- Business Brokers, Hauppauge
- Business Communication Consultants, Hauppauge
- Business Development, Hauppauge
- Business Forms, Systems & Supplies, Hauppauge
- Business Insurance, Hauppauge
- Business Legal Services, Hauppauge
- Business Management Consultants, Hauppauge
- Business Planning & Consulting, Hauppauge
- Business Planning & Organizing, Hauppauge
- Business Services, Hauppauge
- Business Wholesale, Hauppauge
- Business, Vocational & Technical, Hauppauge
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