- Nail Salons, Frederick
- National Government, Frederick
- National Security, Frederick
- Natural Gas Appliances & Equipment, Frederick
- Natural Stone, Frederick - Suppliers & Wholesalers
- Nature Centers, Frederick
- Negligence Attorneys & Lawyers, Frederick
- Nephrologists, Frederick - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Frederick
- Neurologists, Frederick - Neurology Doctors, Physicians & Surgeons
- New Covenant Church, Frederick
- Newspaper Manufacturers, Frederick
- Nickel Minerals & Ores, Frederick
- Non Durable Goods & Products, Frederick
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- Non-Denominational Churches, Frederick
- Noncommercial Research Organizations, Frederick
- Noncommercial Social Research Organization, Frederick
- Nonresidential Building Operators, Frederick
- North American Restaurants, Frederick
- Notary Public, Frederick
- Novelty Gifts & Items Stores, Frederick
- Nurse Certified Practitioners, Frederick
- Nurseries & Garden Centers, Frederick
- Nurses, Frederick
- Nurses Registered, Frederick
- Nursing & Life Care Homes, Frederick
- Nursing Homes, Frederick - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Frederick - Nutrition Centers
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