- Bakeries, Dunnville
- Banks, Dunnville
- Banquet Halls, Dunnville
- Baptist Churches, Dunnville
- Barber Shops, Dunnville
- Barbers, Dunnville
- Bars, Dunnville
- Beach & Water Related Services, Dunnville
- Beauty Salons, Dunnville
- Bed & Breakfast, Dunnville
- Bedroom Furniture Stores, Dunnville - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Dunnville
- Beverage Equipment, Dunnville
- Beverage Stores, Dunnville
- Board Of Education, Dunnville
- Boat Covers, Tops & Upholstery, Dunnville
- Boats & Yachts, Dunnville - Yachts, Sailboats & Boats for Sale
- Bookkeeping Services Licensed, Dunnville
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- Bookkeeping Systems & Services, Dunnville
- Books, Magazines & Newspapers Stores, Dunnville - Bookstores
- Bricks, Blocks & Stone Products, Dunnville - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Dunnville
- Builders & Contractors - More, Dunnville
- Building Construction Consultants, Dunnville - Construction Management & Consulting
- Building Materials, Dunnville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Dunnville
- Bus Lines, Dunnville - Bus Transportation
- Bus Rental & Charter Bus Service, Dunnville
- Business & Professional Associations, Dunnville
- Business & Trade Organizations, Dunnville
- Business Insurance, Dunnville
- Business Legal Services, Dunnville
- Business Management Consultants, Dunnville
- Business Services, Dunnville
- Butcher Shops, Dunnville
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