- Nail Salons, Oakland
- Nail Salons Supplies & Equipment, Oakland
- National Government, Oakland
- National Security, Oakland
- Natural & Holistic Products, Oakland
- Natural Resource, Oakland
- Natural Resource Attorneys & Lawyers, Oakland
- Natural Resource Attorneys & Lawyers, Oakland
- Natural Resource Lawyers & Attorneys, Oakland
- Natural Stone, Oakland - Suppliers & Wholesalers
- Naval Architect, Oakland
- Needlework & Needlework Supplies & Materials, Oakland
- Network Communications, Oakland
- Network Designers, Oakland - Computer Networking Design & Systems
- Neurologists, Oakland - Neurology Doctors, Physicians & Surgeons
- Neuropsychological Testing, Oakland
- New Covenant Church, Oakland
- New Jerusalem Church, Oakland
- New Thought Church, Oakland
- News Service, Oakland - News Syndicates
- Newspaper Manufacturers, Oakland
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- Newspaper Television & Radio Professionals, Oakland
- Night Clubs, Oakland - Nightclub & Night Life
- Non Durable Goods & Products, Oakland
- Non Metallic Minerals, Oakland
- Non-Denominational Churches, Oakland
- Noncommercial Research Organizations, Oakland
- Noncommercial Social Research Organization, Oakland
- Nonresidential Building Operators, Oakland
- North American Restaurants, Oakland
- Notary Public, Oakland
- Novelty Gifts & Items Stores, Oakland
- Nuclear Research & Development, Oakland
- Nurse Certified Practitioners, Oakland
- Nurseries & Garden Centers, Oakland
- Nurseries - Plants & Trees, Oakland - Greenhouses
- Nurseries Wholesale & Growers, Oakland
- Nurses, Oakland
- Nurses Registered, Oakland
- Nursing & Life Care Homes, Oakland
- Nursing Homes, Oakland - Skilled Nursing Facility - Personal Care Centers
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