- Paper & Cardboard Manufacturers, Ontonagon
- Paper Finishers Manufacturers, Ontonagon
- Passenger Vehicle Dealers, Ontonagon
- Performing Arts, Ontonagon
- Personal Care, Ontonagon
- Personal Credit Institutions & Services, Ontonagon
- Personal Legal Services, Ontonagon
- Personal Services, Ontonagon
- Pet Care Services, Ontonagon
- Pet Grooming & Boarding Services, Ontonagon
- Pharmacy & Drug Stores, Ontonagon - Drugstore - Chemists
- Physical Therapists, Ontonagon - Physical Therapy
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- Playgrounds Parks & Trails, Ontonagon
- Plumbers & Plumbing Contractors, Ontonagon - Installation, Repair & Replace Services
- Pottery Retail, Ontonagon
- Preservation & Restoration Services, Ontonagon
- Printing Services & Publishing Services, Ontonagon
- Professional, Ontonagon
- Professional Services, Ontonagon
- Propane & Natural Gas, Ontonagon
- Protective Agencies, Ontonagon
- Public Health Program Administration, Ontonagon
- Public Libraries, Ontonagon
- Pubs, Ontonagon
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