- Machine Shop & Tool Repair Service, Thornhill
- Machinery, Supplies & Equipment - Business Supplies Related, Thornhill
- Machinery, Supplies & Equipment - Construction & Contractor Related, Thornhill
- Maintenance, Cleaning & Sanitation, Thornhill
- Manufacturing, Thornhill
- Manufacturing Products, Thornhill
- Marine Supplies & Equipment, Thornhill - Boat Supplies
- Masonry Contractors, Thornhill - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, Thornhill
- Mildew Removal & Control, Thornhill - Mold Removal
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- Miscellaneous Business Services, Thornhill
- Miscellaneous Personal Services, Thornhill
- Miscellaneous Professional, Thornhill
- Mortgage Bankers & Correspondents, Thornhill
- Mortgage Brokers, Thornhill
- Motor Vehicle, Thornhill
- Motor Vehicle Rental & Leasing, Thornhill
- Motorcycle Parts, Accessories & Dealers, Thornhill
- Moving Companies, Thornhill
- Moving Truck Rental , Thornhill
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