- Baked Goods, Snacks & Sweets, Montmagny
- Bakeries, Montmagny
- Bankruptcy Services, Montmagny
- Banks, Montmagny
- Barber Shop & Beauty Salon Supplies & Equipment, Montmagny - Beauty & Barber Supplies
- Barber Shops, Montmagny
- Beauty Consultants, Montmagny
- Beauty Salons, Montmagny
- Beverage Stores, Montmagny
- Bill Payment Service, Montmagny
- Billiard & Pool Parlors, Montmagny
- Biscuit Companies, Montmagny
- Boats & Yachts, Montmagny - Yachts, Sailboats & Boats for Sale
- Bookkeeping Systems & Services, Montmagny
- Books, Magazines & Newspapers Stores, Montmagny - Bookstores
- Boot & Shoe Repair, Montmagny
- Boutiques & Boutique Items, Montmagny
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- Bowling Centers, Montmagny
- Bread, Montmagny
- Bricks, Blocks & Stone Products, Montmagny - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Montmagny
- Builders & Contractors - More, Montmagny
- Building & Home Inspection, Montmagny - Real Estate, Building, Land & House Inspection Service
- Building & House Movers & Raising Contractors, Montmagny
- Building Construction Consultants, Montmagny - Construction Management & Consulting
- Building Hardware & Materials, Montmagny
- Building Materials & Supplies, Montmagny
- Building Site Preparation Contractors, Montmagny - Land Preparation & Land Clearing
- Bus Repair & Service, Montmagny
- Business & Professional Associations, Montmagny
- Business & Trade Organizations, Montmagny
- Business Legal Services, Montmagny
- Business Services, Montmagny
- Butcher Shops, Montmagny
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