- Nail Salons, Middletown
- National Government, Middletown
- Natural Gas Appliances & Equipment, Middletown
- Naturopathic Doctors, Middletown - Naturopathic Medicine Physicians
- Negligence Attorneys & Lawyers, Middletown
- Negligence Attorneys & Lawyers, Middletown
- Negligence Lawyers & Attorneys, Middletown
- Nephrologists, Middletown - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Designers, Middletown - Computer Networking Design & Systems
- Neurologists, Middletown - Neurology Doctors, Physicians & Surgeons
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- News Service, Middletown - News Syndicates
- Newspaper Manufacturers, Middletown
- Non Power Hand Tools Manufacturers, Middletown
- Non-Denominational Churches, Middletown
- Noncommercial Social Research Organization, Middletown
- Nonresidential Building Operators, Middletown
- North American Restaurants, Middletown
- Nurseries & Garden Centers, Middletown
- Nurses, Middletown
- Nursing Homes, Middletown - Skilled Nursing Facility - Personal Care Centers
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