- Bakeries, Loudonville
- Baking Supplies & Needs, Loudonville - Flavoring Extracts, Flour & More
- Banks, Loudonville
- Banners, Flags, Pennants, Decals, Posters & Signs, Loudonville
- Baptist Churches, Loudonville
- Bars, Loudonville
- Bars & Grills, Loudonville
- Beauty Salons, Loudonville
- Bed & Breakfast, Loudonville
- Beer Taverns, Loudonville
- Bookkeeping Services Licensed, Loudonville
- Bookkeeping Systems & Services, Loudonville
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- Bricks, Blocks & Stone Products, Loudonville - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Loudonville
- Builders & Contractors - More, Loudonville
- Building Hardware & Materials, Loudonville
- Building Materials, Loudonville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Loudonville
- Bus & Other Large Specialty Vehicle Manufacturers, Loudonville
- Business & Professional Associations, Loudonville
- Business Legal Services, Loudonville
- Business Machines Repair, Loudonville
- Business Services, Loudonville
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