- Nail Salons, Trenton
- National Government, Trenton
- National Guard, Trenton
- National Military, Trenton
- Natural Gas Appliances & Equipment, Trenton
- Natural Resource, Trenton
- Nephrologists, Trenton - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Nets & Nettings, Trenton
- Network Communications, Trenton
- Neurologists, Trenton - Neurology Doctors, Physicians & Surgeons
- News Service, Trenton - News Syndicates
- Newsletter Publishers, Trenton
- Newspaper Manufacturers, Trenton
- Newspaper Publishing & Printing, Trenton
- Night Clubs, Trenton - Nightclub & Night Life
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- Non Ceramic Tile, Trenton - Wholesale, Manufacturers & Suppliers
- Non Durable Goods & Products, Trenton
- Non-Denominational Churches, Trenton
- Noncommercial Research Organizations, Trenton
- Noncommercial Social Research Organization, Trenton
- Nonresidential Building Operators, Trenton
- North American Restaurants, Trenton
- Notary Public, Trenton
- Novelty Gifts & Items Stores, Trenton
- Nuclear Medicine Doctors, Trenton - Physicians & Surgeons
- Nurseries & Garden Centers, Trenton
- Nurses, Trenton
- Nursing & Life Care Homes, Trenton
- Nursing Homes, Trenton - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Trenton - Nutrition Centers
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