- Bakeries, Cos Cob
- Balloons - Novelty, Toy & Decorative, Cos Cob
- Banks, Cos Cob
- Barbers, Cos Cob
- Basement Waterproofing - Waterproofing Contractors, Cos Cob - Foundation & Concrete Waterproofing
- Bathroom Fixtures, Cos Cob - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Beauty Salons, Cos Cob
- Bed & Breakfast, Cos Cob
- Beer & Wine Stores, Cos Cob
- Beverage Stores, Cos Cob
- Bicycle Parts & Accessories, Cos Cob
- Bicycle Shops, Cos Cob - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Boat & Saling Clubs, Cos Cob
- Boat Covers, Tops & Upholstery, Cos Cob
- Boat Services, Cos Cob
- Boating & Swimming Clubs, Cos Cob
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- Boats & Yachts, Cos Cob - Yachts, Sailboats & Boats for Sale
- Boutiques & Boutique Items, Cos Cob
- Breakfast Restaurants, Cos Cob
- Builders & Contractors, Cos Cob
- Builders & Contractors - More, Cos Cob
- Building Construction Consultants, Cos Cob - Construction Management & Consulting
- Building Hardware & Materials, Cos Cob
- Building Materials & Supplies, Cos Cob
- Building Materials, Glass, Cos Cob
- Bus Rental & Charter Bus Service, Cos Cob
- Business Brokers, Cos Cob
- Business Insurance, Cos Cob
- Business Legal Services, Cos Cob
- Business Management Consultants, Cos Cob
- Business Services, Cos Cob
- Business, Vocational & Technical, Cos Cob
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