- Painters, Frederick - Painting Contractors
- Painting & Wallpaper Installation Contractors, Frederick - Install - Hang Wallpaper & Wallcoverings
- Passenger Vehicle Dealers, Frederick
- Personal Care, Frederick
- Personal Legal Services, Frederick
- Personal Services, Frederick
- Pest Control Services, Frederick - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Plastic Mold Manufacturers, Frederick
- Plastic Molds & Plastic Processing, Frederick
- Plastic Products Manufacturers, Frederick
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- Plumbers & Plumbing Contractors, Frederick - Installation, Repair & Replace Services
- Plumbers - Information & Referral Services, Frederick
- Plumbing - Sewer & Drain Cleaning & Repair, Frederick
- Police Equipment & Supplies, Frederick - Law Enforcement Gear, Uniforms, etc
- Preschools, Frederick
- Product Rental & Leasing, Frederick
- Product Repair Services, Frederick
- Professional, Frederick
- Professionals Equipment & Supplies, Frederick
- Public Libraries, Frederick
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