- Nail Salons, Boulder
- National Government, Boulder
- Natural Gas Appliances & Equipment, Boulder
- Natural Resource Attorneys & Lawyers, Boulder
- Natural Stone, Boulder - Suppliers & Wholesalers
- Naturopathic Doctors, Boulder - Naturopathic Medicine Physicians
- Naturopathic Practitioners, Boulder
- Needlework & Needlework Supplies & Materials, Boulder
- Neon Signs, Boulder
- Nepalese Restaurants, Boulder
- Nephrologists, Boulder - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Boulder
- Neuropsychological Testing, Boulder
- News Service, Boulder - News Syndicates
- Newspaper Manufacturers, Boulder
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- Night Clubs, Boulder - Nightclub & Night Life
- Noise Measuring Equipment, Boulder
- Non Durable Goods & Products, Boulder
- Non-Denominational Churches, Boulder
- Noncommercial Research Organizations, Boulder
- Noncommercial Social Research Organization, Boulder
- Nonresidential Building Operators, Boulder
- North American Restaurants, Boulder
- Notary Public, Boulder
- Nurse Certified Practitioners, Boulder
- Nurseries & Garden Centers, Boulder
- Nurses, Boulder
- Nurses Registered, Boulder
- Nursing Homes, Boulder - Skilled Nursing Facility - Personal Care Centers
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