- Packaging, Shipping & Labeling Services, Markham
- Painters, Markham - Painting Contractors
- Paneling Materials, Markham
- Parking Lot Road & Airport Services, Markham
- Passenger Ground Transportation, Markham
- Passenger Vehicle Dealers, Markham
- Paving Contractors - Driveway, Road, Walkway, Markham - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pentecostal Churches, Markham
- Personal Care, Markham
- Personal Credit Institutions & Services, Markham
- Personal Legal Services, Markham
- Personal Services, Markham
- Pest Control Services, Markham - Termite Control, Insects & Bed Bug Treatment - Pest Control Companies
- Pet Care Services, Markham
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- Pet Grooming & Boarding, Markham
- Pet Grooming & Boarding Services, Markham
- Pharmacy & Drug Stores, Markham - Drugstore - Chemists
- Pipes, Markham
- Plumbers & Plumbing Contractors, Markham - Installation, Repair & Replace Services
- Plumbing Equipment & Portable Toilet Rental & Leasing, Markham
- Plumbing Fixtures, Equipment, Parts & Supplies, Markham
- Product Rental & Leasing, Markham
- Product Repair Services, Markham
- Professional, Markham
- Professionals Equipment & Supplies, Markham
- Property Operation - Retail Outlet Mall & Establishments, Markham
- Public Libraries, Markham
- Public Transportation Systems, Markham
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