- Packaging & Shipping Materials - Wholesale & Manufacturers , Mercersburg
- Paper & Cardboard Manufacturers, Mercersburg
- Paper Finishers Manufacturers, Mercersburg
- Passenger Vehicle Dealers, Mercersburg
- Paving Contractors - Driveway, Road, Walkway, Mercersburg - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Personal Care, Mercersburg
- Personal Legal Services, Mercersburg
- Personal Services, Mercersburg
- Personnel Consultants & Services, Mercersburg
- Pest Control Services, Mercersburg - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Mercersburg
- Pet Food & Supplies, Mercersburg
- Pet Grooming & Boarding, Mercersburg
- Pet Grooming & Boarding Services, Mercersburg
- Pet Shops & Supplies, Mercersburg
- Pets Stores & Pet Supplies , Mercersburg
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- Pharmacy & Drug Stores, Mercersburg - Drugstore - Chemists
- Photographic Studios, Mercersburg
- Photography, Mercersburg
- Physical Therapists, Mercersburg - Physical Therapy
- Pizza Restaurant 1 Of 2, Mercersburg
- Plants, Trees, Flowers & Seeds, Mercersburg
- Plumbers & Plumbing Contractors, Mercersburg - Installation, Repair & Replace Services
- Plumbing Equipment & Portable Toilet Rental & Leasing, Mercersburg
- Presbyterian Churches, Mercersburg
- Printers Services, Mercersburg
- Printing Services & Publishing Services, Mercersburg
- Product Repair Services, Mercersburg
- Professional, Mercersburg
- Public Libraries, Mercersburg
- Publishing & Printing Manufacturers, Mercersburg
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