- Nail Salons, Ontario
- National Government, Ontario
- National Security, Ontario
- Natural Gas Appliances & Equipment, Ontario
- Natural Stone, Ontario - Suppliers & Wholesalers
- Needlework & Needlework Supplies & Materials, Ontario
- Neon Signs, Ontario
- Network Communications, Ontario
- Network Designers, Ontario - Computer Networking Design & Systems
- Newspaper Manufacturers, Ontario
- Night Clubs, Ontario - Nightclub & Night Life
- Non Durable Goods & Products, Ontario
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- Non-Denominational Churches, Ontario
- Noncommercial Social Research Organization, Ontario
- Nonresidential Building Operators, Ontario
- North American Restaurants, Ontario
- Notary Public, Ontario
- Novelty Gifts & Items Stores, Ontario
- Nurseries & Garden Centers, Ontario
- Nurseries - Plants & Trees, Ontario - Greenhouses
- Nurseries Wholesale & Growers, Ontario
- Nursing & Life Care Homes, Ontario
- Nursing Homes, Ontario - Skilled Nursing Facility - Personal Care Centers
- Nutrition Centers, Ontario - Nutrition Specialists
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