- Backhoe & Bulldozer Contractors, Humboldt - Backhoe & Dozer Services
- Bakeries, Humboldt
- Bankruptcy Services, Humboldt
- Banks, Humboldt
- Banquet Halls, Humboldt
- Barber Shops, Humboldt
- Barbers, Humboldt
- Basement Waterproofing - Waterproofing Contractors, Humboldt - Foundation & Concrete Waterproofing
- Beauty Salons, Humboldt
- Beverage Stores, Humboldt
- Bistros, Humboldt
- Boats & Yachts, Humboldt - Yachts, Sailboats & Boats for Sale
- Book Stores, Humboldt
- Books, Magazines & Newspapers Stores, Humboldt - Bookstores
- Bowling Centers, Humboldt
- Breads & Grains, Humboldt
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- Builders & Contractors, Humboldt
- Builders & Contractors - More, Humboldt
- Builders Hardware Stores, Humboldt
- Building & Home Inspection, Humboldt - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Humboldt
- Building Hardware & Materials, Humboldt
- Building Materials, Humboldt - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Humboldt
- Building Site Preparation Contractors, Humboldt - Land Preparation & Land Clearing
- Bus Lines, Humboldt - Bus Transportation
- Bus Rental & Charter Bus Service, Humboldt
- Business & Professional Associations, Humboldt
- Business Insurance, Humboldt
- Business Legal Services, Humboldt
- Business Management Consultants, Humboldt
- Business Services, Humboldt
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