- Packaging, Shipping & Labeling Services, Northumberland
- Painters, Northumberland - Painting Contractors
- Parking Lot Road & Airport Services, Northumberland
- Passenger Ground Transportation, Northumberland
- Passenger Vehicle Dealers, Northumberland
- Pentecostal Churches, Northumberland
- Personal Care, Northumberland
- Personal Legal Services, Northumberland
- Personal Services, Northumberland
- Petroleum Industry Equipment, Machinery & Supplies, Northumberland
- Pharmacy & Drug Stores, Northumberland - Drugstore - Chemists
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- Physical Therapists, Northumberland - Physical Therapy
- Pizza Restaurant 1 Of 2, Northumberland
- Police Equipment & Supplies, Northumberland - Law Enforcement Gear, Uniforms, etc
- Presbyterian Churches, Northumberland
- Pressure Washing Services, Equipment & Restoration, Northumberland - Pressure Cleaning Service
- Printers Services, Northumberland
- Printing Services & Publishing Services, Northumberland
- Professional, Northumberland
- Public Libraries, Northumberland
- Publishing & Printing Manufacturers, Northumberland
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