- Packaging, Shipping & Labeling Services, Islip
- Paint & Painting Supplies, Islip
- Paint Stores, Islip
- Painters, Islip - Painting Contractors
- Party & Event Planning, Islip
- Party & Event Planning, Decorations, Equipment & Supplies, Islip - Party Supply Stores
- Party Supplies Rentals, Islip
- Passenger Vehicle Dealers, Islip
- Pavement & Parking Lot Construction, Maintenance & Marking, Islip
- Paving Contractors - Driveway, Road, Walkway, Islip - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pediatricians, Islip - Pediatrics Doctors, Physicians & Surgeons
- Pentecostal Churches, Islip
- Periodontist, Islip - Periodontal - Gum Disease
- Personal Care, Islip
- Personal Credit Institutions & Services, Islip
- Personal Legal Services, Islip
- Personal Services, Islip
- Personal Watercraft Dealers, Islip
- Pest Control Services, Islip - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Islip
- Pet Grooming & Boarding, Islip
- Pet Grooming & Boarding Services, Islip
- Pharmacy & Drug Stores, Islip - Drugstore - Chemists
- Photo & Picture Frames, Islip - Picture Framing
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- Photographers, Islip
- Photography, Islip
- Physical Therapists, Islip - Physical Therapy
- Piano Movers & Organ Moving Services, Islip
- Pizza Restaurant 1 Of 2, Islip
- Places Of Religious Worship, Fellowship, & Study, Islip
- Plants, Trees, Flowers & Seeds, Islip
- Playgrounds Parks & Trails, Islip
- Plumbers & Plumbing Contractors, Islip - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Islip
- Podiatrists, Islip - Foot Doctors, Physicians & Surgeons (Podiatric Medicine)
- Post Offices, Islip
- Presbyterian Churches, Islip
- Preschools, Islip
- Printers Services, Islip
- Printing Services & Publishing Services, Islip
- Process Serving Services, Islip - Process Server
- Product Rental & Leasing, Islip
- Product Repair Services, Islip
- Professional, Islip
- Public Accountants, Islip
- Public Libraries, Islip
- Publishing & Printing Manufacturers, Islip
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