- Nail Salons, Lewisville
- National Government, Lewisville
- Nephrologists, Lewisville - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Lewisville
- Network Designers, Lewisville - Computer Networking Design & Systems
- Neurologists, Lewisville - Neurology Doctors, Physicians & Surgeons
- New Mexican Restaurants, Lewisville
- News Service, Lewisville - News Syndicates
- Newspaper Manufacturers, Lewisville
- Night Clubs, Lewisville - Nightclub & Night Life
- Nissan Dealers, Lewisville
- Non Durable Goods & Products, Lewisville
- Noncommercial Research Organizations, Lewisville
- Noncommercial Social Research Organization, Lewisville
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- Nonresidential Building Operators, Lewisville
- North American Restaurants, Lewisville
- Notary Public, Lewisville
- Novelty Gifts & Items Stores, Lewisville
- Novelty, Souvenir & Gift Shops, Lewisville
- Nurseries & Garden Centers, Lewisville
- Nurseries - Plants & Trees, Lewisville - Greenhouses
- Nurses, Lewisville
- Nurses Private Duty, Lewisville
- Nursing & Life Care Homes, Lewisville
- Nursing Homes, Lewisville - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Lewisville - Nutrition Centers
- Nuts & Bolts, Lewisville
- Nuts, Bolts & Other Miscellaneous Metal Fasteners, Lewisville
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