- Backflow Prevention Devices & Services, West Islip
- Bagels, West Islip
- Bakeries, West Islip
- Ballroom Dance Hall, West Islip
- Banks, West Islip
- Banquet Halls, West Islip
- Barber Shops, West Islip
- Barbers, West Islip
- Bars & Grills, West Islip
- Baseball & Softball Clubs, West Islip
- Beauty Salons, West Islip
- Bedding & Linens Stores, West Islip - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, West Islip - Master & Kids Bedroom Furniture Sets & Beds
- Bicycle Rentals, West Islip - Bike Rental
- Bicycle Repair & Service, West Islip - Bike Repair Shops
- Bingo Halls, Supplies & Equipment, West Islip
- Birth Control & Family Planning Clinics, West Islip
- Bistros, West Islip
- Board Of Education, West Islip
- Boat & Yacht Cleaning & Detailing, West Islip
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- Boat Services, West Islip
- Boating & Swimming Clubs, West Islip
- Boats & Yachts, West Islip - Yachts, Sailboats & Boats for Sale
- Book Publishers, West Islip - Book Printing & Publishing
- Book Stores, West Islip
- Brake Service & Repair, West Islip - Brake Pads
- Brick Masonry & Bricklayer Contractors, West Islip - Brick Mason - Install & Repair
- Builders & Contractors, West Islip
- Builders & Contractors - More, West Islip
- Builders Hardware Stores, West Islip
- Building Hardware & Materials, West Islip
- Building Materials & Supplies, West Islip
- Building Materials, Glass, West Islip
- Burglar Alarm Systems, West Islip
- Business & Professional Associations, West Islip
- Business Brokers, West Islip
- Business Insurance, West Islip
- Business Legal Services, West Islip
- Business Management Consultants, West Islip
- Business Services, West Islip
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