- Nail Salons, Bethesda
- Nanny Services, Bethesda
- National Government, Bethesda
- National Security, Bethesda
- Natural Stone, Bethesda - Suppliers & Wholesalers
- Naturopathic Doctors, Bethesda - Naturopathic Medicine Physicians
- Naturopathic Practitioners, Bethesda
- Navigation & Guidance Systems & Instruments, Bethesda
- Needlework & Needlework Supplies & Materials, Bethesda
- Nephrologists, Bethesda - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Bethesda
- News Service, Bethesda - News Syndicates
- Newspaper Manufacturers, Bethesda
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- Non-Denominational Churches, Bethesda
- Noncommercial Research Organizations, Bethesda
- Noncommercial Social Research Organization, Bethesda
- Nonresidential Building Operators, Bethesda
- North American Restaurants, Bethesda
- Notary Public, Bethesda
- Nurseries & Garden Centers, Bethesda
- Nurses, Bethesda
- Nurses Registered, Bethesda
- Nursing & Life Care Homes, Bethesda
- Nursing Homes, Bethesda - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Bethesda - Nutrition Centers
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