- Bakeries, Shelter Island
- Banks, Shelter Island
- Bars & Grills, Shelter Island
- Bathroom Remodeling, Shelter Island - Bathroom Remodel & Planning Services
- Beauty Salons, Shelter Island
- Bed & Breakfast, Shelter Island
- Bicycle Shops, Shelter Island - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat & Yacht Charters, Shelter Island
- Boat Services, Shelter Island
- Boats & Yachts, Shelter Island - Yachts, Sailboats & Boats for Sale
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- Book Publishers, Shelter Island - Book Printing & Publishing
- Boutiques & Boutique Items, Shelter Island
- Brick Masonry & Bricklayer Contractors, Shelter Island - Brick Mason - Install & Repair
- Builders & Contractors, Shelter Island
- Builders & Contractors - More, Shelter Island
- Building Materials & Supplies, Shelter Island
- Burglar Alarm Systems, Shelter Island
- Business & Professional Associations, Shelter Island
- Business Legal Services, Shelter Island
- Business Services, Shelter Island
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