- Nail Salons, North Charleston
- National Government, North Charleston
- National Guard, North Charleston
- National Military, North Charleston
- National Security, North Charleston
- Natural Stone, North Charleston - Suppliers & Wholesalers
- Nephrologists, North Charleston - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, North Charleston
- Network Designers, North Charleston - Computer Networking Design & Systems
- Neurologists, North Charleston - Neurology Doctors, Physicians & Surgeons
- New Jerusalem Church, North Charleston
- Newspaper Manufacturers, North Charleston
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- Night Clubs, North Charleston - Nightclub & Night Life
- Non Durable Goods & Products, North Charleston
- Non-Denominational Churches, North Charleston
- Noncommercial Social Research Organization, North Charleston
- Nonmetallic Mineral Products Manufacturers, North Charleston
- Nonresidential Building Operators, North Charleston
- Nonresidential Painting Contractors, North Charleston - Painters
- North American Restaurants, North Charleston
- Notary Public, North Charleston
- Nurseries & Garden Centers, North Charleston
- Nursing Homes, North Charleston - Skilled Nursing Facility - Personal Care Centers
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