- Nail Salons, Canonsburg
- National Government, Canonsburg
- Natural Stone, Canonsburg - Suppliers & Wholesalers
- Nature Centers, Canonsburg
- Naturopathic Doctors, Canonsburg - Naturopathic Medicine Physicians
- Network Communications, Canonsburg
- Neurologists, Canonsburg - Neurology Doctors, Physicians & Surgeons
- Newspaper Manufacturers, Canonsburg
- Newspaper Television & Radio Professionals, Canonsburg
- Non Woven Fabrics, Canonsburg
- Non-Denominational Churches, Canonsburg
- Nonclay Refractories, Canonsburg
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- Nonferrous Metal Services, Canonsburg
- Nonferrous Rolling & Drawing, Canonsburg
- Nonresidential Building Operators, Canonsburg
- Notary Public, Canonsburg
- Nurse Certified Practitioners, Canonsburg
- Nurse Practitioners, Canonsburg
- Nurseries & Garden Centers, Canonsburg
- Nurses, Canonsburg
- Nursing & Life Care Homes, Canonsburg
- Nursing Homes, Canonsburg - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Canonsburg - Nutrition Centers
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