- Backflow Prevention Devices & Services, Smithtown
- Bagels, Smithtown
- Bakeries, Smithtown
- Balloons & Helium, Smithtown
- Banks, Smithtown
- Barbecue Restaurants, Smithtown
- Barber Shop & Beauty Salon Supplies & Equipment, Smithtown - Beauty & Barber Supplies
- Barber Shops, Smithtown
- Barbers, Smithtown
- Bariatricians, Smithtown - Weight Loss Doctors, Physicians & Surgeons (Eating Disorders & Bariatric Medicine)
- Bars, Smithtown
- Bars & Grills, Smithtown
- Basement Waterproofing - Waterproofing Contractors, Smithtown - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Smithtown - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathtubs & Sinks - Repair & Refinishing, Smithtown - Bathtub Refinishing, Repair & Resurfacing
- Beauty Salons, Smithtown
- Bedroom Furniture Stores, Smithtown - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Smithtown
- Beer Taverns, Smithtown
- Beverage Dispenser Supplies & Equipment , Smithtown - Beverage Dispensing
- Beverage Stores, Smithtown
- Bible Church, Smithtown
- Bicycle Rentals, Smithtown - Bike Rental
- Bicycle Repair & Service, Smithtown - Bike Repair Shops
- Bird Repellent, Barrier & Control, Smithtown
- Birth Control & Family Planning Clinics, Smithtown
- Blind Organizations, Smithtown
- Boat Services, Smithtown
- Boat, Yacht & Sail Boat Transport, Smithtown
- Boats & Yachts, Smithtown - Yachts, Sailboats & Boats for Sale
- Bonds, Smithtown
- Book Stores, Smithtown
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- Bottled Gas, Lp Gas & Propane Dealers, Smithtown
- Boutiques & Boutique Items, Smithtown
- Bowling Centers, Smithtown
- Brake Service & Repair, Smithtown - Brake Pads
- Breakfast Restaurants, Smithtown
- Brick Clay Common Face, Smithtown
- Brick Masonry & Bricklayer Contractors, Smithtown - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Smithtown - Companies, Wholesale, Manufacturers & Suppliers
- Buffet Restaurants, Smithtown
- Builders & Contractors, Smithtown
- Builders & Contractors - More, Smithtown
- Builders Hardware Stores, Smithtown
- Building & Home Inspection, Smithtown - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Smithtown - Construction Management & Consulting
- Building Hardware & Materials, Smithtown
- Building Materials, Smithtown - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Smithtown
- Building Materials, Glass, Smithtown
- Building Site Preparation Contractors, Smithtown - Land Preparation & Land Clearing
- Burglar & Alarm Service, Smithtown - Monitoring Service
- Burglar Alarm Systems, Smithtown
- Business & Professional Associations, Smithtown
- Business & Trade Organizations, Smithtown
- Business Brokers, Smithtown
- Business Communication Consultants, Smithtown
- Business Forms, Systems & Supplies, Smithtown
- Business Insurance, Smithtown
- Business Legal Services, Smithtown
- Business Management Consultants, Smithtown
- Business Planning & Consulting, Smithtown
- Business Services, Smithtown
- Business, Vocational & Technical, Smithtown
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