- Paint & Painting Supplies, Postville
- Paint Stores, Postville
- Paper & Cardboard Manufacturers, Postville
- Paper Finishers Manufacturers, Postville
- Personal Care, Postville
- Personal Credit Institutions & Services, Postville
- Personal Legal Services, Postville
- Personal Services, Postville
- Pizza Restaurant 1 Of 2, Postville
- Plastic Products Manufacturers, Postville
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- Plumbers & Plumbing Contractors, Postville - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Postville
- Presbyterian Churches, Postville
- Preschools, Postville
- Product Repair Services, Postville
- Professional, Postville
- Propane & Natural Gas, Postville
- Public Accountants, Postville
- Public Libraries, Postville
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