- Painters, Southold - Painting Contractors
- Party & Event Planning, Southold
- Party Supplies Rentals, Southold
- Passenger Ground Transportation, Southold
- Passenger Vehicle Dealers, Southold
- Paving Contractors - Driveway, Road, Walkway, Southold - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Periodical Printing & Publishing, Southold - Magazines & Periodical Publishers
- Permit Brokers, Southold
- Personal Care, Southold
- Personal Credit Institutions & Services, Southold
- Personal Legal Services, Southold
- Personal Services, Southold
- Personal Trainers, Southold
- Personal Watercraft Dealers, Southold
- Pest Control Services, Southold - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Southold
- Pet Food & Supplies, Southold
- Pet Grooming & Boarding, Southold
- Pet Grooming & Boarding Services, Southold
- Pet Shops & Supplies, Southold
- Pets Stores & Pet Supplies , Southold
- Pharmacy & Drug Stores, Southold - Drugstore - Chemists
- Physical Therapists, Southold - Physical Therapy
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- Pizza Restaurant 1 Of 2, Southold
- Plants, Trees, Flowers & Seeds, Southold
- Playgrounds Parks & Trails, Southold
- Plumbers & Plumbing Contractors, Southold - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Southold
- Plumbing Equipment & Portable Toilet Rental & Leasing, Southold
- Podiatrists, Southold - Foot Doctors, Physicians & Surgeons (Podiatric Medicine)
- Pottery Retail, Southold
- Power Tools Companies, Southold - Wholesale, Manufacturers & Suppliers
- Pregnancy Counseling & Information Services, Southold
- Presbyterian Churches, Southold
- Printers Services, Southold
- Printing Services & Publishing Services, Southold
- Product Rental & Leasing, Southold
- Product Repair Services, Southold
- Professional, Southold
- Professional Credential, Association, And - Or Degree, Southold
- Professionals Equipment & Supplies, Southold
- Propane & Natural Gas, Southold
- Public Accountants, Southold
- Public Libraries, Southold
- Publishing & Printing Manufacturers, Southold
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