- Bagels, East Islip
- Bakeries, East Islip
- Banks, East Islip
- Barber Shops, East Islip
- Barbers, East Islip
- Bars, East Islip
- Bars & Grills, East Islip
- Beauty Salons, East Islip
- Beer & Wine Stores, East Islip
- Beer Taverns, East Islip
- Beverage Stores, East Islip
- Bicycle Parts & Accessories, East Islip
- Bicycle Shops, East Islip - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat, Yacht & Sail Boat Transport, East Islip
- Boutiques & Boutique Items, East Islip
- Bowling Centers, East Islip
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- Breakfast Restaurants, East Islip
- Brick Masonry & Bricklayer Contractors, East Islip - Brick Mason - Install & Repair
- Builders & Contractors, East Islip
- Builders & Contractors - More, East Islip
- Builders Hardware Stores, East Islip
- Building Construction Consultants, East Islip - Construction Management & Consulting
- Building Materials, East Islip - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, East Islip
- Building Site Preparation Contractors, East Islip - Land Preparation & Land Clearing
- Burglar Alarm Systems, East Islip
- Business & Professional Associations, East Islip
- Business Insurance, East Islip
- Business Legal Services, East Islip
- Business Management Consultants, East Islip
- Business Services, East Islip
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