- Baby Stores, Riverhead - Baby Accessories & Clothes
- Bacteria Control Equipment & Systems, Riverhead
- Bagel Restaurants, Riverhead
- Bagels, Riverhead
- Bail Bonds, Riverhead
- Baker Equipment & Supplies, Riverhead - Donut Maker, etc
- Bakeries, Riverhead
- Balloons & Helium, Riverhead
- Banks, Riverhead
- Banners, Flags, Pennants, Decals, Posters & Signs, Riverhead
- Baptist Churches, Riverhead
- Barbecue Restaurants, Riverhead
- Barber Shops, Riverhead
- Barbers, Riverhead
- Bars, Riverhead
- Bars & Grills, Riverhead
- Basement Pumping Contractors, Riverhead
- Battery, Riverhead - Retail Batteries Stores
- Battery Storage, Riverhead
- Beach & Water Related Services, Riverhead
- Beauty Salons, Riverhead
- Bedding & Linens Stores, Riverhead - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, Riverhead - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Riverhead
- Beer Taverns, Riverhead
- Beverage Alcoholic, Riverhead
- Beverage Manufacturers, Riverhead
- Beverage Stores, Riverhead
- Beverages, Riverhead
- Bicycle Rentals, Riverhead - Bike Rental
- Bicycle Repair & Service, Riverhead - Bike Repair Shops
- Bicycle Shops, Riverhead - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Bill Payment Service, Riverhead
- Billiard Supplies & Equipment, Riverhead - Pool Table
- Biotechnology, Riverhead
- Birth Control & Family Planning Clinics, Riverhead
- Board Of Education, Riverhead
- Board Up Services Contractors, Riverhead
- Boat Covers, Tops & Upholstery, Riverhead
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- Boat Motors & Marine Equipment Dealers, Riverhead
- Boat Trailers, Riverhead
- Boats & Yachts, Riverhead - Yachts, Sailboats & Boats for Sale
- Boiler Rental, Riverhead
- Boiler Repair & Cleaning, Riverhead
- Book Stores, Riverhead
- Books, Magazines & Newspapers Stores, Riverhead - Bookstores
- Bottled Gas, Lp Gas & Propane Dealers, Riverhead
- Bottling Manufacturing, Riverhead
- Boutiques & Boutique Items, Riverhead
- Bowling Centers, Riverhead
- Brake Service & Repair, Riverhead - Brake Pads
- Breakfast Restaurants, Riverhead
- Brick Masonry & Bricklayer Contractors, Riverhead - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Riverhead - Companies, Wholesale, Manufacturers & Suppliers
- Bronze Tablets, Riverhead
- Buffet Restaurants, Riverhead
- Builders & Contractors, Riverhead
- Builders & Contractors - More, Riverhead
- Building & Home Inspection, Riverhead - Real Estate, Building, Land & House Inspection Service
- Building & Land Inspection Service, Riverhead
- Building Cleaning - Exterior, Riverhead - Cleaning Service
- Building Construction Consultants, Riverhead - Construction Management & Consulting
- Building Design & Construction Consultants, Riverhead
- Building Hardware & Materials, Riverhead
- Building Materials, Riverhead - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Riverhead
- Building Site Preparation Contractors, Riverhead - Land Preparation & Land Clearing
- Burglar Alarm Systems, Riverhead
- Bus Rental & Charter Bus Service, Riverhead
- Business & Professional Associations, Riverhead
- Business Brokers, Riverhead
- Business Communication Consultants, Riverhead
- Business Insurance, Riverhead
- Business Legal Services, Riverhead
- Business Management Consultants, Riverhead
- Business Services, Riverhead
- Business, Vocational & Technical, Riverhead
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