- Bakeries, Key Biscayne
- Banks, Key Biscayne
- Bars, Key Biscayne
- Bars & Grills, Key Biscayne
- Beach & Water Related Services, Key Biscayne
- Beauty Salons, Key Biscayne
- Beer & Ale - Wholesale, Key Biscayne
- Beer & Wine Stores, Key Biscayne
- Beer Taverns, Key Biscayne
- Beverage Stores, Key Biscayne
- Beverages, Key Biscayne
- Bicycle Rentals, Key Biscayne - Bike Rental
- Bicycle Shops, Key Biscayne - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat & Yacht Charter, Key Biscayne
- Boating & Swimming Clubs, Key Biscayne
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- Book Publishers, Key Biscayne - Book Printing & Publishing
- Book Stores, Key Biscayne
- Boutiques & Boutique Items, Key Biscayne
- Builders & Contractors, Key Biscayne
- Builders Hardware Stores, Key Biscayne
- Building & Property Maintenance & Services, Key Biscayne
- Building Construction Consultants, Key Biscayne - Construction Management & Consulting
- Building Design & Construction Consultants, Key Biscayne
- Building Materials & Supplies, Key Biscayne
- Burglar Alarm Systems, Key Biscayne
- Business & Professional Associations, Key Biscayne
- Business Legal Services, Key Biscayne
- Business Management Consultants, Key Biscayne
- Business Services, Key Biscayne
- Business, Vocational & Technical, Key Biscayne
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