- Nail Salons, Appleton
- Name Plates & Tags, Appleton
- National Government, Appleton
- Natural Stone, Appleton - Suppliers & Wholesalers
- Nature Centers, Appleton
- Nephrologists, Appleton - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Appleton
- Network Designers, Appleton - Computer Networking Design & Systems
- Neurologists, Appleton - Neurology Doctors, Physicians & Surgeons
- News Service, Appleton - News Syndicates
- Newspaper Manufacturers, Appleton
- Night Clubs, Appleton - Nightclub & Night Life
- Non Durable Goods & Products, Appleton
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- Non-Denominational Churches, Appleton
- Noncommercial Research Organizations, Appleton
- Noncommercial Social Research Organization, Appleton
- Nonferrous Metal Services, Appleton
- Nonresidential Building Operators, Appleton
- North American Restaurants, Appleton
- Novelty Gifts & Items Stores, Appleton
- Nurseries & Garden Centers, Appleton
- Nurseries - Plants & Trees, Appleton - Greenhouses
- Nurses, Appleton
- Nursing & Life Care Homes, Appleton
- Nursing Homes, Appleton - Skilled Nursing Facility - Personal Care Centers
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