- Nail Salons, Riverhead
- National Government, Riverhead
- Natural Gas Appliances & Equipment, Riverhead
- Naturopathic Doctors, Riverhead - Naturopathic Medicine Physicians
- Needlework & Needlework Supplies & Materials, Riverhead
- Nephrologists, Riverhead - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Neurologists, Riverhead - Neurology Doctors, Physicians & Surgeons
- News Service, Riverhead - News Syndicates
- Newspaper Manufacturers, Riverhead
- Non Ceramic Tile, Riverhead - Wholesale, Manufacturers & Suppliers
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- Non Durable Goods & Products, Riverhead
- Noncommercial Social Research Organization, Riverhead
- North American Restaurants, Riverhead
- Notary Public, Riverhead
- Nuclear Medicine Doctors, Riverhead - Physicians & Surgeons
- Nurse Certified Practitioners, Riverhead
- Nurse Practitioners, Riverhead
- Nurseries & Garden Centers, Riverhead
- Nurseries - Plants & Trees, Riverhead - Greenhouses
- Nurses, Riverhead
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