- Nail Salons, Arlington Heights
- National Government, Arlington Heights
- Nephrologists, Arlington Heights - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Arlington Heights
- Network Designers, Arlington Heights - Computer Networking Design & Systems
- Neurologists, Arlington Heights - Neurology Doctors, Physicians & Surgeons
- Newspaper Manufacturers, Arlington Heights
- Night Clubs, Arlington Heights - Nightclub & Night Life
- Non Power & Hand Tools, Arlington Heights
- Non-Current Carrying Wiring Devices Manufacturers, Arlington Heights
- Non-Denominational Churches, Arlington Heights
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- Noncommercial Social Research Organization, Arlington Heights
- Nonresidential Building Operators, Arlington Heights
- North American Restaurants, Arlington Heights
- Notary Public, Arlington Heights
- Novelty Gifts & Items Stores, Arlington Heights
- Nurse Practitioners, Arlington Heights
- Nurseries & Garden Centers, Arlington Heights
- Nurses, Arlington Heights
- Nursing Homes, Arlington Heights - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Arlington Heights - Nutrition Centers
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