- Paint & Painting Supplies, East Islip
- Paint Stores, East Islip
- Painters, East Islip - Painting Contractors
- Paper & Cardboard Manufacturers, East Islip
- Paper Finishers Manufacturers, East Islip
- Paper Products, East Islip - Paper Dealers & Distributors
- Parking Garage, East Islip - Commercial
- Parking Lot & Garage, East Islip
- Party & Event Planning, East Islip
- Party Supplies Rentals, East Islip
- Passenger Air Transportation, East Islip
- Passenger Ground Transportation, East Islip
- Passenger Vehicle Dealers, East Islip
- Passenger Water Transportation, East Islip
- Pavement & Parking Lot Construction, Maintenance & Marking, East Islip
- Paving Contractors - Driveway, Road, Walkway, East Islip - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pediatricians, East Islip - Pediatrics Doctors, Physicians & Surgeons
- Personal Care, East Islip
- Personal Credit Institutions & Services, East Islip
- Personal Financial Services, East Islip
- Personal Injury Attorneys & Lawyers, East Islip
- Personal Injury Attorneys & Lawyers, East Islip
- Personal Injury Lawyers & Attorneys, East Islip
- Personal Legal Services, East Islip
- Personal Services, East Islip
- Pest Control Services, East Islip - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, East Islip
- Pet Food & Supplies, East Islip
- Pet Grooming & Boarding, East Islip
- Pet Grooming & Boarding Services, East Islip
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- Pet Shops & Supplies, East Islip
- Pets Stores & Pet Supplies , East Islip
- Pharmacy & Drug Stores, East Islip - Drugstore - Chemists
- Pharmacy & Pharmaceutical Consultants, East Islip
- Physical Therapists, East Islip - Physical Therapy
- Piano Movers & Organ Moving Services, East Islip
- Pipe Thawing, East Islip
- Pizza Delivery Service, East Islip
- Pizza Restaurant 1 Of 2, East Islip
- Plants, Trees, Flowers & Seeds, East Islip
- Plastic Surgeons, East Islip - Plastic Surgery Doctors, Physicians & Surgeons
- Playgrounds Parks & Trails, East Islip
- Plumbers & Plumbing Contractors, East Islip - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, East Islip
- Plumbing Equipment & Portable Toilet Rental & Leasing, East Islip
- Podiatrists, East Islip - Foot Doctors, Physicians & Surgeons (Podiatric Medicine)
- Preschools, East Islip
- Printers Services, East Islip
- Printing Services & Publishing Services, East Islip
- Product Rental & Leasing, East Islip
- Product Repair Services, East Islip
- Professional, East Islip
- Professional Services, East Islip
- Propane & Natural Gas, East Islip
- Public Accountants, East Islip
- Public Libraries, East Islip
- Public Transportation Systems, East Islip
- Publishing & Printing Manufacturers, East Islip
- Pubs, East Islip
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