- Pain Management Doctors, Port Jefferson - Pain Medicine Physicians & Surgeons
- Paint Stores, Port Jefferson
- Painters, Port Jefferson - Painting Contractors
- Paper & Cardboard Manufacturers, Port Jefferson
- Paper Finishers Manufacturers, Port Jefferson
- Parking Lot Road & Airport Services, Port Jefferson
- Party & Event Planning, Port Jefferson - Special Events
- Party & Event Planning, Port Jefferson
- Passenger Ground Transportation, Port Jefferson
- Passenger Water Transportation, Port Jefferson
- Pasta Restaurants, Port Jefferson
- Pavement & Parking Lot Construction, Maintenance & Marking, Port Jefferson
- Pediatricians, Port Jefferson - Pediatrics Doctors, Physicians & Surgeons
- Perfume, Cologne & Fragrance Outlets, Port Jefferson
- Periodontist, Port Jefferson - Periodontal - Gum Disease
- Personal Care, Port Jefferson
- Personal Credit Institutions & Services, Port Jefferson
- Personal Injury Attorneys & Lawyers, Port Jefferson
- Personal Injury Attorneys & Lawyers, Port Jefferson
- Personal Injury Lawyers & Attorneys, Port Jefferson
- Personal Legal Services, Port Jefferson
- Personal Services, Port Jefferson
- Personal Trainers, Port Jefferson
- Personal Watercraft Dealers, Port Jefferson
- Personnel Consultants & Services, Port Jefferson
- Pest Control Services, Port Jefferson - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Port Jefferson
- Pet Feeding & Exercising Services, Port Jefferson
- Pet Food & Supplies, Port Jefferson
- Pet Shops & Supplies, Port Jefferson
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- Pets Stores & Pet Supplies , Port Jefferson
- Pharmacy & Drug Stores, Port Jefferson - Drugstore - Chemists
- Pharmacy & Pharmaceutical Consultants, Port Jefferson
- Photo & Picture Frames, Port Jefferson - Picture Framing
- Photographers, Port Jefferson
- Photography, Port Jefferson
- Photography, Port Jefferson
- Physical Therapists, Port Jefferson - Physical Therapy
- Piano Parts & Supplies, Port Jefferson
- Piano Tuning, Repair & Refinish, Port Jefferson
- Pizza Restaurant 1 Of 2, Port Jefferson
- Plants - Interior Design & Maintenance, Port Jefferson - Plant Rental & Maintenance
- Plumbers & Plumbing Contractors, Port Jefferson - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Port Jefferson
- Presbyterian Churches, Port Jefferson
- Preschools, Port Jefferson
- Printers Services, Port Jefferson
- Printing Services & Publishing Services, Port Jefferson
- Product Repair Services, Port Jefferson
- Professional, Port Jefferson
- Professional Services, Port Jefferson
- Professionals Equipment & Supplies, Port Jefferson
- Promotional Products, Port Jefferson - Promotional Items, Corporate Gifts, Personalized Gifts, etc
- Promotional Services, Port Jefferson
- Psychiatric Clinics, Port Jefferson
- Psychiatrists, Port Jefferson - Psychiatry Doctors, Physicians & Surgeons
- Public Accountants, Port Jefferson
- Public Libraries, Port Jefferson
- Public Relations Consultants & Counselors, Port Jefferson
- Publishing & Printing Manufacturers, Port Jefferson
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