- Nail Salons, Rockville
- Nails & Tacks, Rockville
- Name Plates & Tags, Rockville
- Nanny Services, Rockville
- National Government, Rockville
- Natural Stone, Rockville - Suppliers & Wholesalers
- Naturopathic Doctors, Rockville - Naturopathic Medicine Physicians
- Naturopathic Practitioners, Rockville
- Negligence Attorneys & Lawyers, Rockville
- Negligence Attorneys & Lawyers, Rockville
- Negligence Lawyers & Attorneys, Rockville
- Network Communications, Rockville
- Network Designers, Rockville - Computer Networking Design & Systems
- Neurologists, Rockville - Neurology Doctors, Physicians & Surgeons
- News Service, Rockville - News Syndicates
- Newsletter Publishers, Rockville
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- Newspaper Manufacturers, Rockville
- Newspaper Publishing & Printing, Rockville
- Non Ceramic Tile, Rockville - Wholesale, Manufacturers & Suppliers
- Non Durable Goods & Products, Rockville
- Non-Denominational Churches, Rockville
- Noncommercial Research Organizations, Rockville
- Noncommercial Social Research Organization, Rockville
- Nonresidential Building Operators, Rockville
- North American Restaurants, Rockville
- Notary Public, Rockville
- Novelty Gifts & Items Stores, Rockville
- Nurseries & Garden Centers, Rockville
- Nurses, Rockville
- Nursing & Life Care Homes, Rockville
- Nursing Homes, Rockville - Skilled Nursing Facility - Personal Care Centers
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