- Baby Stores, Ontario - Baby Accessories & Clothes
- Bakeries, Ontario
- Baking Supplies & Needs, Ontario - Flavoring Extracts, Flour & More
- Banks, Ontario
- Banquet Halls, Ontario
- Baptist Churches, Ontario
- Barber Shops, Ontario
- Barbers, Ontario
- Bars, Ontario
- Bars & Grills, Ontario
- Bathroom Remodeling, Ontario - Bathroom Remodel & Planning Services
- Beauty Salons, Ontario
- Bed Parts & Frames Metal Wood & Other, Ontario
- Bedding & Linens Stores, Ontario - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, Ontario - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Ontario - Bee Removal Companies
- Beer & Wine Stores, Ontario
- Beer Taverns, Ontario
- Beverage & Juice Bottlers Manufacturers, Ontario
- Beverage Dispenser Supplies & Equipment , Ontario - Beverage Dispensing
- Beverage Non-Alcoholic Manufacturers, Ontario
- Beverage Stores, Ontario
- Biological Products & Supplies, Ontario
- Biological Research, Ontario - Biological Labs
- Bird Repellent, Barrier & Control, Ontario
- Blueprint Service, Ontario - Blueprinting Services
- Board Of Education, Ontario
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- Boats & Yachts, Ontario - Yachts, Sailboats & Boats for Sale
- Bonds, Ontario
- Book Stores, Ontario
- Bookkeeping Services Licensed, Ontario
- Bookkeeping Systems & Services, Ontario
- Books, Magazines & Newspapers Stores, Ontario - Bookstores
- Bottling Manufacturing, Ontario
- Boutiques & Boutique Items, Ontario
- Bowling Centers, Ontario
- Breakfast Restaurants, Ontario
- Brick Masonry & Bricklayer Contractors, Ontario - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, Ontario - Companies, Wholesale, Manufacturers & Suppliers
- Buffet Restaurants, Ontario
- Builders & Contractors, Ontario
- Builders & Contractors - More, Ontario
- Building & Property Maintenance & Services, Ontario
- Building Construction Consultants, Ontario - Construction Management & Consulting
- Building Materials, Ontario - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Ontario
- Bus Rental & Charter Bus Service, Ontario
- Business & Professional Associations, Ontario
- Business Colleges, Ontario
- Business Insurance, Ontario
- Business Legal Services, Ontario
- Business Management Consultants, Ontario
- Business Services, Ontario
- Business, Vocational & Technical, Ontario
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