- Bakeries, Markham
- Banks, Markham
- Banquet Halls, Markham
- Baptist Churches, Markham
- Barbers, Markham
- Bars, Markham
- Bars & Grills, Markham
- Beauty Cosmetic & Salon Equipment & Supplies Manufacturers, Markham
- Beauty Salons, Markham
- Beer & Wine Stores, Markham
- Beer Taverns, Markham
- Beverage Stores, Markham
- Boiler & Furnace Contractors, Markham - Installation, Cleaning & Repair Services
- Breakfast Restaurants, Markham
- Bricks, Blocks & Stone Products, Markham - Companies, Wholesale, Manufacturers & Suppliers
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- Brooms & Brushes, Markham
- Brooms & Brushes Manufacturers, Markham
- Brushes Manufacturers, Markham
- Builders & Contractors, Markham
- Builders & Contractors - More, Markham
- Building & Home Inspection, Markham - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Markham
- Building Construction Consultants, Markham - Construction Management & Consulting
- Building Materials & Supplies, Markham
- Bus Lines, Markham - Bus Transportation
- Business Communication Consultants, Markham
- Business Legal Services, Markham
- Business Management Consultants, Markham
- Business Services, Markham
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