- Painters, New Haven - Painting Contractors
- Paper Products - Wholesale & Manufacturers, New Haven
- Passenger Vehicle Dealers, New Haven
- Personal Care, New Haven
- Personal Credit Institutions & Services, New Haven
- Personal Services, New Haven
- Pet Care Services, New Haven
- Pet Grooming & Boarding Services, New Haven
- Pharmacy & Drug Stores, New Haven - Drugstore - Chemists
- Photofinishing Laboratories, New Haven
- Photographers, New Haven
- Photography, New Haven
- Pipe Bending & Fabricating, New Haven
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- Pizza Restaurant 1 Of 2, New Haven
- Plumbers & Plumbing Contractors, New Haven - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, New Haven
- Preschools, New Haven
- Preservation & Restoration Services, New Haven
- Pressed & Blown Glass Manufacturers, New Haven
- Printers Services, New Haven
- Product Repair Services, New Haven
- Professional, New Haven
- Professionals Equipment & Supplies, New Haven
- Public Health Program Administration, New Haven
- Public Libraries, New Haven
- Publishing & Printing Manufacturers, New Haven
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