- Balloons - Novelty, Toy & Decorative, Newmarket
- Banks, Newmarket
- Barbers, Newmarket
- Bars, Newmarket
- Bartending Service, Newmarket
- Beauty Salons, Newmarket
- Beer Taverns, Newmarket
- Bicycle Parts & Accessories, Newmarket
- Bicycle Shops, Newmarket - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Newmarket
- Blacksmiths, Newmarket
- Boiler & Furnace Contractors, Newmarket - Installation, Cleaning & Repair Services
- Book Stores, Newmarket
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- Books, Magazines & Newspapers Stores, Newmarket - Bookstores
- Buddhist Churches, Newmarket
- Builders & Contractors, Newmarket
- Builders & Contractors - More, Newmarket
- Building & Property Maintenance & Services, Newmarket
- Building Construction Consultants, Newmarket - Construction Management & Consulting
- Building Materials & Supplies, Newmarket
- Burglar Alarm Systems, Newmarket
- Business & Professional Associations, Newmarket
- Business & Trade Organizations, Newmarket
- Business Legal Services, Newmarket
- Business Management Consultants, Newmarket
- Business Services, Newmarket
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