- Hair Care Professionals, Markham
- Hair Weaving, Markham
- Hamburger Restaurants, Markham
- Hardware Stores, Markham
- Health & Medical, Markham
- Health And Medical Centers, Markham
- Healthcare Providers, Practitioners & Professionals, Markham
- Heating & Air Conditioning Equipment, Parts & Supplies, Markham - HVAC Suppliers & Companies
- Heating & Air-Conditioning Contractors, Markham - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating Contractors, Markham - Heating Systems - Installation & Repair
- Highway Surfacing & Paving Contractors, Markham - Pavers - Paving Companies
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- Home & Consumer Electronics & Appliances Rental, Markham
- Home Additions & Remodeling Contractors, Markham - Refinishing & Restoration
- Home Health Care, Markham - Agencies & Services
- Horse Stables, Markham
- Hospital, Dental & Medical Equipment & Supplies, Markham
- Hospitals, Markham
- Hot Dog Restaurants, Markham
- Hotels & Motels, Markham
- Household Goods & Furniture Storage , Markham
- Hunting & Fishing Equipment, Supplies & Services, Markham
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