- Nail Salons, Peterborough
- National Government, Peterborough
- Natural Gas Appliances & Equipment, Peterborough
- Natural Stone, Peterborough - Suppliers & Wholesalers
- Naturopathic Alternative Medicine, Peterborough
- Naturopathic Doctors, Peterborough - Naturopathic Medicine Physicians
- Needlework & Needlework Supplies & Materials, Peterborough
- Network Communications, Peterborough
- Neurologists, Peterborough - Neurology Doctors, Physicians & Surgeons
- Newspaper Manufacturers, Peterborough
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