- Bakeries, Winthrop
- Bank Supplies & Equipment, Winthrop
- Banks, Winthrop
- Barbers, Winthrop
- Bars & Grills, Winthrop
- Baseball & Softball Clubs, Winthrop
- Beauty Salons, Winthrop
- Bed & Breakfast, Winthrop
- Beverage Stores, Winthrop
- Billing Services, Winthrop
- Bistros, Winthrop
- Boat Covers, Tops & Upholstery, Winthrop
- Boating & Swimming Clubs, Winthrop
- Boats & Yachts, Winthrop - Yachts, Sailboats & Boats for Sale
- Book Stores, Winthrop
- Books, Magazines & Newspapers Stores, Winthrop - Bookstores
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- Boutiques & Boutique Items, Winthrop
- Breakfast Restaurants, Winthrop
- Brick & Structural Product Manufacturers, Winthrop
- Builders & Contractors, Winthrop
- Builders & Contractors - More, Winthrop
- Builders Hardware Stores, Winthrop
- Building Construction Consultants, Winthrop - Construction Management & Consulting
- Building Hardware & Materials, Winthrop
- Building Materials & Supplies, Winthrop
- Business & Professional Associations, Winthrop
- Business Forms, Systems & Supplies, Winthrop
- Business Insurance, Winthrop
- Business Legal Services, Winthrop
- Business Management Consultants, Winthrop
- Business Services, Winthrop
- Business, Vocational & Technical, Winthrop
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