- Nail Salons, Fairfield
- Nanny Services, Fairfield
- National Government, Fairfield
- National Military, Fairfield
- National Security, Fairfield
- Native American Agencies, Fairfield
- Natural Landscaping Stone, Fairfield
- Negligence Attorneys & Lawyers, Fairfield
- Negligence Attorneys & Lawyers, Fairfield
- Negligence Lawyers & Attorneys, Fairfield
- Network Designers, Fairfield - Computer Networking Design & Systems
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- Newspaper Manufacturers, Fairfield
- Non Durable Goods & Products, Fairfield
- Non-Denominational Churches, Fairfield
- Noncommercial Social Research Organization, Fairfield
- Nonresidential Building Operators, Fairfield
- North American Restaurants, Fairfield
- Notary Public, Fairfield
- Nurseries & Garden Centers, Fairfield
- Nurseries - Plants & Trees, Fairfield - Greenhouses
- Nursing & Life Care Homes, Fairfield
- Nursing Homes, Fairfield - Skilled Nursing Facility - Personal Care Centers
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