- Packaging, Shipping & Labeling Services, Wallingford
- Parking Lot Road & Airport Services, Wallingford
- Party & Event Planning, Wallingford
- Party & Event Planning, Decorations, Equipment & Supplies, Wallingford - Party Supply Stores
- Passenger Vehicle Dealers, Wallingford
- Passenger Water Transportation, Wallingford
- Patio, Porch & Deck Builders, Wallingford - Installation, Repair & Maintenance Services
- Pediatricians, Wallingford - Pediatrics Doctors, Physicians & Surgeons
- Personal Care, Wallingford
- Personal Legal Services, Wallingford
- Personal Services, Wallingford
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- Pharmacy & Drug Stores, Wallingford - Drugstore - Chemists
- Places Of Religious Worship, Fellowship, & Study, Wallingford
- Plumbers & Plumbing Contractors, Wallingford - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Wallingford
- Presbyterian Churches, Wallingford
- Preschools, Wallingford
- Product Rental & Leasing, Wallingford
- Product Repair Services, Wallingford
- Professional, Wallingford
- Public Libraries, Wallingford
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