- Nail Salons, Houston
- Nail Salons Supplies & Equipment, Houston
- Name Plates & Tags, Houston
- Nanny Services, Houston
- National Commercial Banks, Houston
- National Government, Houston
- National Security, Houston
- Natural Gas Appliances & Equipment, Houston
- Natural Health School, Houston
- Natural Landscaping Stone, Houston
- Natural Resource, Houston
- Natural Stone, Houston - Suppliers & Wholesalers
- Nature Centers, Houston
- Naturopathic Doctors, Houston - Naturopathic Medicine Physicians
- Naturopathic Practitioners, Houston
- Naval Architect, Houston
- Navigation & Guidance Systems & Instruments, Houston
- Navigation Schools, Houston
- Needlework & Needlework Supplies & Materials, Houston
- Neon Signs, Houston
- Nephrologists, Houston - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Houston
- Network Designers, Houston - Computer Networking Design & Systems
- Neurologists, Houston - Neurology Doctors, Physicians & Surgeons
- Neuropsychology, Houston
- New Covenant Church, Houston
- New Jerusalem Church, Houston
- News Service, Houston - News Syndicates
- News Sports Services, Houston
- Newspaper Manufacturers, Houston
- Newspaper Television & Radio Professionals, Houston
- Night Club Equipment, Houston
- Night Clubs, Houston - Nightclub & Night Life
- Nissan Dealers, Houston
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- Noise Control Consultants, Houston
- Non Ceramic Tile, Houston - Wholesale, Manufacturers & Suppliers
- Non Durable Goods & Products, Houston
- Non Metallic Minerals, Houston
- Non Power Hand Tools Manufacturers, Houston
- Non Woven Fabrics, Houston
- Non-Denominational Churches, Houston
- Nonclay Refractories, Houston
- Noncommercial Research Organizations, Houston
- Noncommercial Social Research Organization, Houston
- Nondestructive Testing Labs, Houston
- Nonmetallic Mineral Products Manufacturers, Houston
- Nonresidential Building Operators, Houston
- North American Restaurants, Houston
- Notary Public, Houston
- Novelty Gifts & Items Stores, Houston
- Novelty, Souvenir & Gift Shops, Houston
- Nurse Certified Practitioners, Houston
- Nurse Practitioners, Houston
- Nurseries & Garden Centers, Houston
- Nurseries - Plants & Trees, Houston - Greenhouses
- Nurseries Wholesale & Growers, Houston
- Nurses, Houston
- Nurses Licensed, Houston
- Nurses Private Duty, Houston
- Nurses Registered, Houston
- Nursing & Life Care Homes, Houston
- Nursing Homes, Houston - Skilled Nursing Facility - Personal Care Centers
- Nut Processing Equipment, Houston
- Nutrition Centers, Houston - Nutrition Specialists
- Nutritionists & Nutrition Consultants, Houston - Nutrition Centers
- Nuts & Bolts, Houston
- Nuts Edible Processing, Houston
- Nuts, Bolts & Other Miscellaneous Metal Fasteners, Houston
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