- Machine Shop, Thorold
- Machine Shop & Tool Repair Service, Thorold
- Machinery And Equipment Manufacturers, Thorold
- Machinery Custom Design Manufacturers, Thorold
- Machinery, Supplies & Equipment - Business Production Related, Thorold
- Machinery, Supplies & Equipment - Business Supplies Related, Thorold
- Machinery, Supplies & Equipment - Construction & Contractor Related, Thorold
- Major Appliances, Thorold - Household & Kitchen
- Management Consultants & Services, Thorold
- Manicurists & Pedicurists, Thorold
- Manufacturing, Thorold
- Manufacturing Products, Thorold
- Marine Products And Services, Thorold
- Marine Services, Thorold
- Masonry Contractors, Thorold - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Thorold
- Massage Therapists & Professional, Thorold
- Massage Therapy, Thorold
- Mausoleums Developers, Thorold
- Meat Market, Wholesale & Products, Thorold
- Medical Research Facilities, Thorold - Research & Development Centers
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- Medical Supplies & Equipment, Thorold
- Membership Sports & Recreation Clubs, Thorold
- Men's Clothing Stores, Thorold - Clothes & Accessories
- Mental Health Specialists, Thorold - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, Thorold
- Metal Heat Treating, Thorold
- Metal Plating & Polishing, Thorold
- Metal Repair Service & Blacksmith, Thorold - Iron Works
- Millwrights, Thorold
- Miscellaneous Government, Thorold
- Miscellaneous Industry, Thorold
- Miscellaneous Personal Services, Thorold
- Miscellaneous Professional, Thorold
- Monuments, Tombstones, Markers & Memorials, Thorold
- Motor Vehicle, Thorold
- Motor Vehicle Rental & Leasing, Thorold
- Movie Theaters, Thorold
- Moving Truck Rental , Thorold
- Muffler Shop & Exhaust Systems, Thorold
- Music, Thorold
- Musical Instruments & Equipment Stores, Thorold
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