- Paint & Painting Supplies, Groton
- Paint Stores, Groton
- Paper & Cardboard Manufacturers, Groton
- Paper Finishers Manufacturers, Groton
- Passenger Ground Transportation, Groton
- Passenger Vehicle Dealers, Groton
- Personal Care, Groton
- Personal Credit Institutions & Services, Groton
- Personal Legal Services, Groton
- Personal Service Consultants, Groton
- Personal Services, Groton
- Pharmacy & Drug Stores, Groton - Drugstore - Chemists
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- Pizza Restaurant 1 Of 2, Groton
- Plant Products & By Products, Groton
- Plants, Trees, Flowers & Seeds, Groton
- Plumbers & Plumbing Contractors, Groton - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Groton
- Post Offices, Groton
- Presbyterian Churches, Groton
- Preschools, Groton
- Product Repair Services, Groton
- Professional, Groton
- Professional Services, Groton
- Public Transportation Systems, Groton
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