- Paper & Cardboard Manufacturers, Umatilla
- Paper Finishers Manufacturers, Umatilla
- Passenger Ground Transportation, Umatilla
- Passenger Vehicle Dealers, Umatilla
- Personal Care, Umatilla
- Personal Legal Services, Umatilla
- Personal Services, Umatilla
- Personal Watercraft Dealers, Umatilla
- Pest Control Products, Umatilla
- Pest Control Services, Umatilla - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pest Control Supplies & Equipment, Umatilla
- Pet Care Services, Umatilla
- Pet Grooming & Boarding, Umatilla
- Pet Grooming & Boarding Services, Umatilla
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- Pharmacy & Drug Stores, Umatilla - Drugstore - Chemists
- Pizza Restaurant 1 Of 2, Umatilla
- Plants, Trees, Flowers & Seeds, Umatilla
- Plastic & Plastic Products, Umatilla
- Plastic Products, Umatilla
- Playgrounds Parks & Trails, Umatilla
- Plumbers & Plumbing Contractors, Umatilla - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Umatilla
- Presbyterian Churches, Umatilla
- Pressure Washing Services, Equipment & Restoration, Umatilla - Pressure Cleaning Service
- Process Serving Services, Umatilla - Process Server
- Product Repair Services, Umatilla
- Professional, Umatilla
- Public Accountants, Umatilla
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