- Bagels, Rockville Centre
- Bakeries, Rockville Centre
- Bank Supplies & Equipment, Rockville Centre
- Banks, Rockville Centre
- Banners, Flags, Pennants, Decals, Posters & Signs, Rockville Centre
- Baptist Churches, Rockville Centre
- Barbecue Restaurants, Rockville Centre
- Barber Shops, Rockville Centre
- Barbers, Rockville Centre
- Bars, Rockville Centre
- Bars & Grills, Rockville Centre
- Basement Pumping Contractors, Rockville Centre
- Basement Waterproofing - Waterproofing Contractors, Rockville Centre - Foundation & Concrete Waterproofing
- Bathing Accessories, Rockville Centre
- Bathroom Remodeling, Rockville Centre - Bathroom Remodel & Planning Services
- Beauty Salons, Rockville Centre
- Bedroom Furniture Stores, Rockville Centre - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Rockville Centre
- Beer Taverns, Rockville Centre
- Beverage Stores, Rockville Centre
- Bicycle Rentals, Rockville Centre - Bike Rental
- Bicycle Repair & Service, Rockville Centre - Bike Repair Shops
- Billing Services, Rockville Centre
- Bird Repellent, Barrier & Control, Rockville Centre
- Bistros, Rockville Centre
- Blueprint Service, Rockville Centre - Blueprinting Services
- Boiler Repair & Cleaning, Rockville Centre
- Bonds, Rockville Centre
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- Book Publishers, Rockville Centre - Book Printing & Publishing
- Book Stores, Rockville Centre
- Books, Magazines & Newspapers Stores, Rockville Centre - Bookstores
- Boutiques & Boutique Items, Rockville Centre
- Bowling Centers, Rockville Centre
- Bowling Lane Equipment & Supplies, Rockville Centre
- Breakfast Restaurants, Rockville Centre
- Brick Masonry & Bricklayer Contractors, Rockville Centre - Brick Mason - Install & Repair
- Builders & Contractors, Rockville Centre
- Builders & Contractors - More, Rockville Centre
- Builders Hardware Stores, Rockville Centre
- Building & Home Inspection, Rockville Centre - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Rockville Centre
- Building Construction Consultants, Rockville Centre - Construction Management & Consulting
- Building Design & Construction Consultants, Rockville Centre
- Building Materials, Rockville Centre - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Rockville Centre
- Burglar Alarm Systems, Rockville Centre
- Business & Professional Associations, Rockville Centre
- Business & Trade Organizations, Rockville Centre
- Business Brokers, Rockville Centre
- Business Insurance, Rockville Centre
- Business Legal Services, Rockville Centre
- Business Management Consultants, Rockville Centre
- Business Planning & Consulting, Rockville Centre
- Business Services, Rockville Centre
- Business Studio Rental, Rockville Centre
- Business, Vocational & Technical, Rockville Centre
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