- Machine Shop & Tool Repair Service, Ontario
- Machine Shop Rotary Surface Grinding, Ontario - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Ontario
- Machinery, Supplies & Equipment - Business Production Related, Ontario
- Machinery, Supplies & Equipment - Business Supplies Related, Ontario
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ontario
- Magazine & Newspaper Stands, Ontario - Dealers & Distributors
- Mail Delivery Service, Ontario
- Major Appliances, Ontario - Household & Kitchen
- Malls & Shopping Centers, Ontario
- Management Consultants & Services, Ontario
- Manicurists & Pedicurists, Ontario
- Manufacturing, Ontario
- Manufacturing Products, Ontario
- Marriage & Family Counselors, Ontario
- Masonry Contractors, Ontario - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Ontario
- Mechanical Contractors, Ontario - Install, Service & Repair
- Medical & Dental Assistant Schools, Ontario
- Medical Equipment Manufacturers, Ontario
- Medical Supplies & Equipment, Ontario
- Membership Sports & Recreation Clubs, Ontario
- Men's Clothing Stores, Ontario - Clothes & Accessories
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- Mental Health Specialists, Ontario - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Ontario
- Methodist Church, Ontario
- Mexican Restaurants, Ontario
- Mini & Self Storage, Ontario
- Miscellaneous Household Item Repair, Ontario
- Miscellaneous Government, Ontario
- Miscellaneous Personal Services, Ontario
- Miscellaneous Photographers, Ontario
- Miscellaneous Professional, Ontario
- Money Transfer Service, Ontario
- Mortgage Bankers & Correspondents, Ontario
- Motion Picture Pre & Post Production Services, Ontario
- Motor Vehicle, Ontario
- Motor Vehicle Rental & Leasing, Ontario
- Movie Theaters, Ontario
- Moving Truck Rental , Ontario
- Mulch, Peat & Moss Products, Ontario
- Museums, Ontario
- Music, Ontario
- Musical Instruments & Equipment Stores, Ontario
- Musical Instruments Repair, Sales & Service, Ontario
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