- Package Preparation, Shipment & Mail Services, Northport
- Packaging & Shipping Materials - Wholesale & Manufacturers , Northport
- Packaging Service, Northport
- Packaging, Shipping & Labeling Services, Northport
- Painters, Northport - Painting Contractors
- Paper Products - Wholesale & Manufacturers, Northport
- Passenger Vehicle Dealers, Northport
- Passenger Water Transportation, Northport
- Patent Owners & Lessors, Northport
- Paving Contractors - Driveway, Road, Walkway, Northport - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pension Health & Welfare Funds, Northport
- Periodical Printing & Publishing, Northport - Magazines & Periodical Publishers
- Personal Care, Northport
- Personal Credit Institutions & Services, Northport
- Personal Legal Services, Northport
- Personal Service Agents, Northport
- Personal Services, Northport
- Personal Watercraft Dealers, Northport
- Pest Control Services, Northport - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Northport
- Pet Grooming & Boarding, Northport
- Pet Grooming & Boarding Services, Northport
- Pet Products & Services, Northport
- Pet Shops & Supplies, Northport
- Pets Stores & Pet Supplies , Northport
- Pharmacy & Drug Stores, Northport - Drugstore - Chemists
- Photo & Picture Frames, Northport - Picture Framing
- Photofinishing Laboratories, Northport
- Photographers, Northport
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- Photography, Northport
- Photography, Northport
- Physical Therapists, Northport - Physical Therapy
- Pizza Restaurant 1 Of 2, Northport
- Plants, Trees, Flowers & Seeds, Northport
- Plastic Machinery & Equipment, Northport
- Plumbers & Plumbing Contractors, Northport - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Northport
- Podiatrists, Northport - Foot Doctors, Physicians & Surgeons (Podiatric Medicine)
- Post Offices, Northport
- Presbyterian Churches, Northport
- Preschools, Northport
- Print Brokers, Northport
- Printers Services, Northport
- Printing & Copying Services, Northport
- Printing Services & Publishing Services, Northport
- Private Schools Secondary Schools, Northport
- Process Serving Services, Northport - Process Server
- Product Repair Services, Northport
- Professional, Northport
- Professional Engineers, Northport
- Professionals Equipment & Supplies, Northport
- Prosthodontist, Northport - Partial Dentures, Dental Implant, Bridge, Crown, etc
- Psychiatrists, Northport - Psychiatry Doctors, Physicians & Surgeons
- Public Accountants, Northport
- Public Libraries, Northport
- Public Relations Consultants & Counselors, Northport
- Publishing & Printing Manufacturers, Northport
- Pubs, Northport
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