- Backflow Prevention Devices & Services, Ontario
- Bakeries, Ontario
- Baking Supplies & Needs, Ontario - Flavoring Extracts, Flour & More
- Banking Attorneys & Lawyers, Ontario
- Banking Attorneys & Lawyers, Ontario
- Banking Lawyers & Attorneys, Ontario
- Banks, Ontario
- Banners, Flags, Pennants, Decals, Posters & Signs, Ontario
- Banquet Halls, Ontario
- Banquet Halls, Reception Halls & Party Facilities, Ontario
- Baptist Churches, Ontario
- Barbers, Ontario
- Bars, Ontario
- Bars & Grills, Ontario
- Baseball Cards & Sports Memorabilia, Ontario
- Battery Stores, Ontario
- Bearings, Ontario
- Beauty Salons, Ontario
- Bedroom Furniture Stores, Ontario - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Ale - Wholesale, Ontario
- Beer & Wine Stores, Ontario
- Beer Taverns, Ontario
- Beverage & Juice Bottlers Manufacturers, Ontario
- Beverage Non-Alcoholic Manufacturers, Ontario
- Beverage Stores, Ontario
- Beverages, Ontario
- Bicycle Repair & Service, Ontario - Bike Repair Shops
- Bicycle Shops, Ontario - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Birth Control & Family Planning Clinics, Ontario
- Bistros, Ontario
- Blouses, Shirts & Sweater Manufacturers, Ontario
- Boat Covers, Tops & Upholstery, Ontario
- Boat Services, Ontario
- Boats & Yachts, Ontario - Yachts, Sailboats & Boats for Sale
- Bonds, Ontario
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- Bonds Surety & Fidelity, Ontario
- Book Stores, Ontario
- Bookkeeping Services Licensed, Ontario
- Bookkeeping Systems & Services, Ontario
- Boots Retail, Ontario
- Bottled Gas, Lp Gas & Propane Dealers, Ontario
- Bottling Manufacturing, Ontario
- Boutiques & Boutique Items, Ontario
- Bowling Centers, Ontario
- Brake Service & Repair, Ontario - Brake Pads
- Breakfast Restaurants, Ontario
- Brew Pubs, Ontario
- Bricks, Blocks & Stone Products, Ontario - Companies, Wholesale, Manufacturers & Suppliers
- Buddhist Churches, Ontario
- Buffet Restaurants, Ontario
- Builders & Contractors, Ontario
- Builders & Contractors - More, Ontario
- Builders Hardware Stores, Ontario
- Building & Home Inspection, Ontario - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Ontario - Construction Management & Consulting
- Building Hardware & Materials, Ontario
- Building Materials, Ontario - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Ontario
- Building Materials Used, Ontario
- Burglar & Alarm Service, Ontario - Monitoring Service
- Burglar Alarm Systems, Ontario
- Bus Lines, Ontario - Bus Transportation
- Business & Professional Associations, Ontario
- Business & Trade Organizations, Ontario
- Business Forms, Systems & Supplies, Ontario
- Business Legal Services, Ontario
- Business Services, Ontario
- Business, Vocational & Technical, Ontario
- Butcher Shops, Ontario
- Butchers & Meat Markets - Manufacturers, Ontario
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