- Baby Stores, Central Islip - Baby Accessories & Clothes
- Bagel Restaurants, Central Islip
- Bagels, Central Islip
- Bail Bonds, Central Islip
- Bakeries, Central Islip
- Bank Supplies & Equipment, Central Islip
- Banks, Central Islip
- Baptist Churches, Central Islip
- Barber Shops, Central Islip
- Barbers, Central Islip
- Bars, Central Islip
- Bars & Grills, Central Islip
- Baseball & Softball Clubs, Central Islip
- Bathing Accessories, Central Islip
- Bathroom Fixtures, Central Islip - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Battery, Central Islip - Retail Batteries Stores
- Battery Storage, Central Islip
- Beauty Salons, Central Islip
- Beer & Wine Stores, Central Islip
- Bible Church, Central Islip
- Board Up Services Contractors, Central Islip
- Boats & Yachts, Central Islip - Yachts, Sailboats & Boats for Sale
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- Book Binders & Folders, Central Islip - Office Supplies
- Bottled Gas, Lp Gas & Propane Dealers, Central Islip
- Brake Service & Repair, Central Islip - Brake Pads
- Breakfast Restaurants, Central Islip
- Builders & Contractors, Central Islip
- Builders & Contractors - More, Central Islip
- Building Construction Consultants, Central Islip - Construction Management & Consulting
- Building Hardware & Materials, Central Islip
- Building Materials, Central Islip - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Central Islip
- Building Materials, Glass, Central Islip
- Building Site Preparation Contractors, Central Islip - Land Preparation & Land Clearing
- Burglar & Alarm Service, Central Islip - Monitoring Service
- Burglar Alarm Systems, Central Islip
- Bus Lines, Central Islip - Bus Transportation
- Business & Professional Associations, Central Islip
- Business Communication Consultants, Central Islip
- Business Legal Services, Central Islip
- Business Management Consultants, Central Islip
- Business Services, Central Islip
- Business, Vocational & Technical, Central Islip
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