- Nail Salons, San Dimas
- Name Plates & Tags, San Dimas
- National Government, San Dimas
- Natural Health School, San Dimas
- Navigation & Guidance Systems & Instruments, San Dimas
- Network Designers, San Dimas - Computer Networking Design & Systems
- News Service, San Dimas - News Syndicates
- News Sports Services, San Dimas
- Night Clubs, San Dimas - Nightclub & Night Life
- Non-Denominational Churches, San Dimas
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- Noncommercial Research Organizations, San Dimas
- North American Restaurants, San Dimas
- Notary Public, San Dimas
- Nurseries & Garden Centers, San Dimas
- Nurseries - Plants & Trees, San Dimas - Greenhouses
- Nurseries Wholesale & Growers, San Dimas
- Nursing & Life Care Homes, San Dimas
- Nursing Homes, San Dimas - Skilled Nursing Facility - Personal Care Centers
- Nuts & Bolts, San Dimas
- Nuts, Bolts & Other Miscellaneous Metal Fasteners, San Dimas
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