- Nail Salons, Thornhill
- Nanny Services, Thornhill
- National Government, Thornhill
- Natural Health School, Thornhill
- Natural Stone, Thornhill - Suppliers & Wholesalers
- Naturopathic Alternative Medicine, Thornhill
- Naturopathic Doctors, Thornhill - Naturopathic Medicine Physicians
- Naturopathic Practitioners, Thornhill
- Needlework & Needlework Supplies & Materials, Thornhill
- Neon Signs, Thornhill
- Network Communications, Thornhill
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- Network Designers, Thornhill - Computer Networking Design & Systems
- Newspaper Manufacturers, Thornhill
- Night Clubs, Thornhill - Nightclub & Night Life
- Non Durable Goods & Products, Thornhill
- Nonresidential Building Operators, Thornhill
- North American Restaurants, Thornhill
- Notary Public, Thornhill
- Novelty, Souvenir & Gift Shops, Thornhill
- Nurseries & Garden Centers, Thornhill
- Nurses, Thornhill
- Nutritionists & Nutrition Consultants, Thornhill - Nutrition Centers
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