- Paint & Painting Supplies, Castroville
- Paint Stores, Castroville
- Painters, Castroville - Painting Contractors
- Paper & Cardboard Manufacturers, Castroville
- Paper Finishers Manufacturers, Castroville
- Party & Event Planning, Castroville
- Passenger Vehicle Dealers, Castroville
- Paving Contractors - Driveway, Road, Walkway, Castroville - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Personal Care, Castroville
- Personal Credit Institutions & Services, Castroville
- Personal Legal Services, Castroville
- Personal Services, Castroville
- Pest Control Products, Castroville
- Pest Control Services, Castroville - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pest Control Supplies & Equipment, Castroville
- Pet Food & Supplies, Castroville
- Pet Shops & Supplies, Castroville
- Pets Stores & Pet Supplies , Castroville
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- Pharmacy & Drug Stores, Castroville - Drugstore - Chemists
- Photographic Studios, Castroville
- Photography, Castroville
- Physical Therapists, Castroville - Physical Therapy
- Pizza Delivery Service, Castroville
- Pizza Restaurant 1 Of 2, Castroville
- Plumbers & Plumbing Contractors, Castroville - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Castroville
- Portable Buildings, Castroville
- Pottery Retail, Castroville
- Prefab Homes, Buildings & Structures, Castroville - Prefabricated Homes - Building Systems & Components
- Preschools, Castroville
- Preservation & Restoration Services, Castroville
- Product Rental & Leasing, Castroville
- Product Repair Services, Castroville
- Professional, Castroville
- Public Accountants, Castroville
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