- Paint Stores, Southwest Harbor
- Passenger Vehicle Dealers, Southwest Harbor
- Passenger Water Transportation, Southwest Harbor
- Personal Care, Southwest Harbor
- Personal Legal Services, Southwest Harbor
- Personal Services, Southwest Harbor
- Personal Watercraft Dealers, Southwest Harbor
- Pharmacy & Drug Stores, Southwest Harbor - Drugstore - Chemists
- Physical Therapists, Southwest Harbor - Physical Therapy
- Pilates Instruction, Southwest Harbor
- Pizza Restaurant 1 Of 2, Southwest Harbor
- Plants, Trees, Flowers & Seeds, Southwest Harbor
- Plumbers & Plumbing Contractors, Southwest Harbor - Installation, Repair & Replace Services
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- Plumbing & Drainage - Supplies & Materials, Southwest Harbor
- Plumbing Equipment & Portable Toilet Rental & Leasing, Southwest Harbor
- Printing Services & Publishing Services, Southwest Harbor
- Product Rental & Leasing, Southwest Harbor
- Product Repair Services, Southwest Harbor
- Professional, Southwest Harbor
- Professional Services, Southwest Harbor
- Promotional Products, Southwest Harbor - Promotional Items, Corporate Gifts, Personalized Gifts, etc
- Promotional Services, Southwest Harbor
- Propane & Natural Gas, Southwest Harbor
- Public Accountants, Southwest Harbor
- Public Libraries, Southwest Harbor
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