- Machinery, Supplies & Equipment - Business Supplies Related, Markham
- Mailing, Delivery & Courier Service, Markham
- Malls & Shopping Centers, Markham
- Management Consultants & Services, Markham
- Manicurists & Pedicurists, Markham
- Manufacturing, Markham
- Manufacturing Products, Markham
- Marriage & Family Counselors, Markham
- Meat Market, Wholesale & Products, Markham
- Medical Supplies & Equipment, Markham
- Membership Sports & Recreation Clubs, Markham
- Men's Clothing Stores, Markham - Clothes & Accessories
- Mennonite Church, Markham
- Mental Health Specialists, Markham - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Markham
- Metal Coating & Allied Services, Markham
- Metal Cutting Services, Markham
- Metal Repair Service & Blacksmith, Markham - Iron Works
- Mexican Restaurants, Markham
- Mini & Self Storage, Markham
- Miscellaneous Household Item Repair, Markham
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- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Markham
- Miscellaneous Government, Markham
- Miscellaneous Industry, Markham
- Miscellaneous Manufacturing, Markham
- Miscellaneous Personal Services, Markham
- Miscellaneous Professional, Markham
- Monuments, Tombstones, Markers & Memorials, Markham
- Motivational & Self Improvement Schools, Markham
- Motor Vehicle, Markham
- Motor Vehicle Rental & Leasing, Markham
- Motorcycle & Motor Scooters Dealers, Repair & Service, Markham
- Motorcycle Parts, Accessories & Dealers, Markham
- Motorcycle Repair & Service, Markham
- Moving Companies, Markham
- Moving Services - Labor & Material, Markham
- Moving Truck Rental , Markham
- Muffler Shop & Exhaust Systems, Markham
- Music, Markham
- Music Sheet, Markham
- Music Stores Retail, Markham
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