- Machinery, Supplies & Equipment - Business Supplies Related, Markdale
- Machinery, Supplies & Equipment - Construction & Contractor Related, Markdale
- Manufacturing, Markdale
- Manufacturing Products, Markdale
- Marine & Boat Products, Markdale
- Marine Contractors & Designers, Markdale
- Masonry Materials & Supplies, Markdale
- Membership Sports & Recreation Clubs, Markdale
- Mental Health Specialists, Markdale - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Markdale
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- Miscellaneous Household Item Repair, Markdale
- Miscellaneous Government, Markdale
- Miscellaneous Personal Services, Markdale
- Miscellaneous Professional, Markdale
- Moldings Materials, Markdale
- Monuments, Tombstones, Markers & Memorials, Markdale
- Motor Vehicle, Markdale
- Motor Vehicle Rental & Leasing, Markdale
- Moving Truck Rental , Markdale
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