- Bakeries, Louisville
- Baking Supplies & Needs, Louisville - Flavoring Extracts, Flour & More
- Banking Attorneys & Lawyers, Louisville
- Banking Attorneys & Lawyers, Louisville
- Banking Lawyers & Attorneys, Louisville
- Bankruptcy Attorneys & Lawyers, Louisville
- Bankruptcy Attorneys & Lawyers, Louisville
- Bankruptcy Lawyers & Attorneys, Louisville
- Banks, Louisville
- Banners, Flags, Pennants, Decals, Posters & Signs, Louisville
- Banquet Halls, Louisville
- Baptist Churches, Louisville
- Barbecue Restaurants, Louisville
- Barber Shops, Louisville
- Barbers, Louisville
- Bars, Louisville
- Bars & Grills, Louisville
- Bathroom Remodeling, Louisville - Bathroom Remodel & Planning Services
- Beach & Water Related Services, Louisville
- Beauty Salons, Louisville
- Beer & Wine Stores, Louisville
- Beer Taverns, Louisville
- Beverage Stores, Louisville
- Beverages, Louisville
- Bible Church, Louisville
- Bicycle Shops, Louisville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Louisville
- Biological Research, Louisville - Biological Labs
- Biotechnology Products & Services, Louisville
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- Bistros, Louisville
- Blind Services & Facilities, Louisville
- Bonds, Louisville
- Book Publishers, Louisville - Book Printing & Publishing
- Book Stores, Louisville
- Books, Magazines & Newspapers Stores, Louisville - Bookstores
- Boutiques & Boutique Items, Louisville
- Bowling Centers, Louisville
- Brake Service & Repair, Louisville - Brake Pads
- Breakfast Restaurants, Louisville
- Brew Pubs, Louisville
- Builders & Contractors, Louisville
- Builders & Contractors - More, Louisville
- Builders Hardware Stores, Louisville
- Building & Home Inspection, Louisville - Real Estate, Building, Land & House Inspection Service
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- Building Construction Consultants, Louisville - Construction Management & Consulting
- Building Materials, Louisville - Wholesale, Manufacturers, Dealers & Suppliers
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- Business & Professional Associations, Louisville
- Business Brokers, Louisville
- Business Communication Consultants, Louisville
- Business Forms, Systems & Supplies, Louisville
- Business Insurance, Louisville
- Business Legal Services, Louisville
- Business Machines Repair, Louisville
- Business Management Consultants, Louisville
- Business Services, Louisville
- Business, Vocational & Technical, Louisville
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