- Painters, Block Island - Painting Contractors
- Paper & Cardboard Manufacturers, Block Island
- Paper Finishers Manufacturers, Block Island
- Passenger Air Transportation, Block Island
- Passenger Water Transportation, Block Island
- Personal Care, Block Island
- Personal Services, Block Island
- Pest Control Services, Block Island - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pharmacy & Drug Stores, Block Island - Drugstore - Chemists
- Photofinishing Laboratories, Block Island
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- Photography, Block Island
- Pizza Restaurant 1 Of 2, Block Island
- Printers Services, Block Island
- Printing Services & Publishing Services, Block Island
- Product Rental & Leasing, Block Island
- Product Repair Services, Block Island
- Professional, Block Island
- Propane & Natural Gas, Block Island
- Publishing & Printing Manufacturers, Block Island
- Pubs, Block Island
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