- Nail Salons, Dayton
- Name Plates & Tags, Dayton
- National Commercial Banks, Dayton
- National Government, Dayton
- National Military, Dayton
- National Security, Dayton
- Natural Resource Attorneys & Lawyers, Dayton
- Natural Resource Attorneys & Lawyers, Dayton
- Natural Resource Lawyers & Attorneys, Dayton
- Natural Stone, Dayton - Suppliers & Wholesalers
- Needlework & Needlework Supplies & Materials, Dayton
- Negligence Attorneys & Lawyers, Dayton
- Negligence Lawyers & Attorneys, Dayton
- Nephrologists, Dayton - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Dayton
- Network Designers, Dayton - Computer Networking Design & Systems
- Neurologists, Dayton - Neurology Doctors, Physicians & Surgeons
- Neuropathic Pain Doctors, Dayton - Neuropathy Physicians & Surgeons
- New Age Church, Dayton
- Newspaper Manufacturers, Dayton
- Night Clubs, Dayton - Nightclub & Night Life
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- Non Durable Goods & Products, Dayton
- Non Metallic Minerals, Dayton
- Non-Denominational Churches, Dayton
- Noncommercial Research Organizations, Dayton
- Noncommercial Social Research Organization, Dayton
- Nonmetallic Mineral Services, Dayton
- Nonresidential Building Operators, Dayton
- Nonresidential Painting Contractors, Dayton - Painters
- North American Restaurants, Dayton
- Notary Public, Dayton
- Novelty Gifts & Items Stores, Dayton
- Nurse Certified Practitioners, Dayton
- Nurseries & Garden Centers, Dayton
- Nurseries Wholesale & Growers, Dayton
- Nurses, Dayton
- Nurses Private Duty, Dayton
- Nurses Registered, Dayton
- Nursing & Life Care Homes, Dayton
- Nursing Homes, Dayton - Skilled Nursing Facility - Personal Care Centers
- Nuts & Bolts, Dayton
- Nuts, Bolts & Other Miscellaneous Metal Fasteners, Dayton
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