- Nail Salons, Fontana
- Nail Salons Supplies & Equipment, Fontana
- National Government, Fontana
- New Testament Church, Fontana
- Newspaper Manufacturers, Fontana
- Night Clubs, Fontana - Nightclub & Night Life
- Non Durable Goods & Products, Fontana
- Non-Denominational Churches, Fontana
- Nonclay Refractories, Fontana
- Noncommercial Social Research Organization, Fontana
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- North American Restaurants, Fontana
- Notary Public, Fontana
- Novelty Gifts & Items Stores, Fontana
- Nurseries & Garden Centers, Fontana
- Nurseries Wholesale & Growers, Fontana
- Nurses, Fontana
- Nursing Homes, Fontana - Skilled Nursing Facility - Personal Care Centers
- Nutrition Centers, Fontana - Nutrition Specialists
- Nuts, Bolts & Other Miscellaneous Metal Fasteners, Fontana
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