- Paper & Cardboard Manufacturers, Duncannon
- Paper Finishers Manufacturers, Duncannon
- Passenger Ground Transportation, Duncannon
- Passenger Vehicle Dealers, Duncannon
- Paving Contractors - Driveway, Road, Walkway, Duncannon - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pediatricians, Duncannon - Pediatrics Doctors, Physicians & Surgeons
- Pentecostal Churches, Duncannon
- Personal Care, Duncannon
- Personal Credit Institutions & Services, Duncannon
- Personal Injury Attorneys & Lawyers, Duncannon
- Personal Injury Attorneys & Lawyers, Duncannon
- Personal Injury Lawyers & Attorneys, Duncannon
- Personal Legal Services, Duncannon
- Personal Service Agents, Duncannon
- Personal Services, Duncannon
- Personal Watercraft Dealers, Duncannon
- Pest Control Services, Duncannon - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pest Control Supplies & Equipment, Duncannon
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- Pet Care Services, Duncannon
- Pet Grooming & Boarding Services, Duncannon
- Pet Shops & Supplies, Duncannon
- Pets Stores & Pet Supplies , Duncannon
- Pharmacy & Drug Stores, Duncannon - Drugstore - Chemists
- Physical Therapists, Duncannon - Physical Therapy
- Pizza Restaurant 1 Of 2, Duncannon
- Plumbers & Plumbing Contractors, Duncannon - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Duncannon
- Presbyterian Churches, Duncannon
- Preschools, Duncannon
- Product Repair Services, Duncannon
- Professional, Duncannon
- Public Accountants, Duncannon
- Pubs, Duncannon
- Pumping & Drilling Contractors, Duncannon
- Pumping Contractors, Duncannon - Water Well, Concrete & Septic Tank Pumping
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