- Nail Art Designing
- Nail Care Products Retail
- Natural Fiber Rope Manufacture
- Natural Gas Distribution
- Natural Gas Pipelines
- Natural Home & Cleaning Products
- Natural Remedies Shops
- Nature & Wildlife Photography
- Nautical Line and Fender Manufacturing
- Naval architecture services
- Navigation Equipment Manufacturing
- Negotiating contracts with employers and governments
- Network cabling and wiring
- Network equipment manufacturers/suppliers
- Network Infrastructure Builders and Operators
- Network & Security Consultancy
- Network security consulting services
- Network Solutions and Systems Integration
- Network Television Programming
- Networking Software Publishing
- Neurologists
- Neurology
- Neurology Services
- News outlets
- Newsletter Publishing
- Nickel Alloy Wire Cold Drawing
- Nickel Production
- Non-Alcoholic Beverage Serving
- Non-Emergency Medical Transportation (NEMT)
- Non-Ferrous Metal Production
- Non-Hazardous Waste Treatment and Disposal
- Non-profit
- Non-profit Associations
- Non-Store Retailers
- Non-woven fabric production
- Nonmetallic mineral mining and quarrying
- Nursery Production
- Nutraceuticals
- Nutraceuticals Retailers
- Nutrition Counseling and Meal Planning Services