- Paper & Cardboard Manufacturers, Frederick
- Paper Finishers Manufacturers, Frederick
- Passenger Vehicle Dealers, Frederick
- Pentecostal Churches, Frederick
- Personal Care, Frederick
- Personal Credit Institutions & Services, Frederick
- Personal Legal Services, Frederick
- Personal Services, Frederick
- Pest Control Services, Frederick - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Frederick
- Pet Grooming & Boarding Services, Frederick
- Pharmacy & Drug Stores, Frederick - Drugstore - Chemists
- Phone Companies - Long Distance Service, Frederick
- Photographers, Frederick
- Photography, Frederick
- Photography Equipment Repair & Service, Frederick
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- Pizza Restaurant 1 Of 2, Frederick
- Plumbers & Plumbing Contractors, Frederick - Installation, Repair & Replace Services
- Plumbing - Sewer & Drain Cleaning & Repair, Frederick
- Presbyterian Churches, Frederick
- Preschools, Frederick
- Print Ads - Newspaper Advertising, Frederick
- Printers Services, Frederick
- Printing Services & Publishing Services, Frederick
- Product Rental & Leasing, Frederick
- Product Repair Services, Frederick
- Professional, Frederick
- Property Insurance, Frederick
- Public Accountants, Frederick
- Public Health Program Administration, Frederick
- Publishing & Printing Manufacturers, Frederick
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