- Nail Salons, Altoona
- National Government, Altoona
- National Military, Altoona
- National Security, Altoona
- Needlework & Needlework Supplies & Materials, Altoona
- Negligence Attorneys & Lawyers, Altoona
- Nephrologists, Altoona - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Neurologists, Altoona - Neurology Doctors, Physicians & Surgeons
- Newspaper Manufacturers, Altoona
- Newspaper Television & Radio Professionals, Altoona
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- Night Clubs, Altoona - Nightclub & Night Life
- Non-Denominational Churches, Altoona
- Noncommercial Social Research Organization, Altoona
- North American Restaurants, Altoona
- Notary Public, Altoona
- Nurseries & Garden Centers, Altoona
- Nurses, Altoona
- Nursing & Life Care Homes, Altoona
- Nursing Homes, Altoona - Skilled Nursing Facility - Personal Care Centers
- Nutritionists & Nutrition Consultants, Altoona - Nutrition Centers
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