- Machine Shop & Tool Repair Service, Ontario
- Machine Tools , Ontario
- Machinery, Supplies & Equipment - Business Supplies Related, Ontario
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ontario
- Magazine & Newspaper Stands, Ontario - Dealers & Distributors
- Manicurists & Pedicurists, Ontario
- Manufacturing, Ontario
- Manufacturing Products, Ontario
- Marriage & Family Counselors, Ontario
- Martial Arts & Self Defense Schools, Ontario
- Masonry Contractors, Ontario - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, Ontario
- Mechanical Contractors, Ontario - Install, Service & Repair
- Medical Equipment Manufacturers, Ontario
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- Mental Health Specialists, Ontario - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Distributors, Ontario
- Methodist Church, Ontario
- Miscellaneous Government, Ontario
- Mobile Home Parks & Communities , Ontario
- Modular & Mobile Homes For Sale, Ontario - Manufactured Homes Sale & Service
- Motion Picture Pre & Post Production Services, Ontario
- Motor Vehicle, Ontario
- Motor Vehicle Rental & Leasing, Ontario
- Motorcycle Parts, Accessories & Dealers, Ontario
- Moving Truck Rental , Ontario
- Music, Ontario
- Musical Recording Services, Ontario
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