- Paper & Cardboard Manufacturers, Fullerton
- Paper Finishers Manufacturers, Fullerton
- Passenger Vehicle Dealers, Fullerton
- Personal Care, Fullerton
- Personal Credit Institutions & Services, Fullerton
- Personal Legal Services, Fullerton
- Personal Service Consultants, Fullerton
- Personal Services, Fullerton
- Pharmacy & Drug Stores, Fullerton - Drugstore - Chemists
- Photofinishing Laboratories, Fullerton
- Photographers, Fullerton
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- Photography, Fullerton
- Plants - Interior Design & Maintenance, Fullerton - Plant Rental & Maintenance
- Plumbers & Plumbing Contractors, Fullerton - Installation, Repair & Replace Services
- Presbyterian Churches, Fullerton
- Preschools, Fullerton
- Product Repair Services, Fullerton
- Professional, Fullerton
- Propane & Natural Gas, Fullerton
- Public Accountants, Fullerton
- Public Libraries, Fullerton
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