- Machine Shop, Ontario
- Machine Shop & Tool Repair Service, Ontario
- 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
- Mailbox Rental Services, Ontario
- Mailing, Delivery & Courier Service, Ontario
- Maintenance, Cleaning & Sanitation, Ontario
- Major Appliances, Ontario - Household & Kitchen
- Malls & Shopping Centers, Ontario
- Manicurists & Pedicurists, Ontario
- Manufacturing, Ontario
- Manufacturing Products, Ontario
- Marine Supplies & Equipment, Ontario - Boat Supplies
- Market Research & Analysis , Ontario - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Ontario
- Martial Arts & Self Defense Schools, Ontario
- Masonry Materials & Supplies, Ontario
- Massage Therapists & Professional, Ontario
- Massage Therapy, Ontario
- Meat Market, Wholesale & Products, Ontario
- Meat Packers, Ontario
- Medical & Health Service Organizations, Ontario
- Medical Alert Systems, Ontario - Medical Alarms - PERS
- Medical Diagnostic Clinics, Ontario - Clinical Labs & Centers
- Medical Supplies & Equipment, Ontario
- Men's & Boys Clothing & Accessories Stores, Ontario
- Men's Clothing Stores, Ontario - Clothes & Accessories
- Mennonite Church, Ontario
- Mens & Boys Jeans & Western Wear Stores, Ontario
- Mental Health Specialists, Ontario - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Ontario
- Merchandise Sales Events, Ontario
- Metal Buildings, Ontario - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Ontario
- Metal Repair Service & Blacksmith, Ontario - Iron Works
- Methodist Church, Ontario
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- Mexican Food, Ontario
- Mexican Food & Goods Products, Ontario
- Mexican Restaurants, Ontario
- Midwives, Ontario
- Mildew Removal & Control, Ontario - Mold Removal
- Mini & Self Storage, Ontario
- Miniatures Collectors, Ontario
- Mining, Ontario
- Miscellaneous Agriculture, Ontario
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Ontario
- Miscellaneous Government, Ontario
- Miscellaneous Industry, Ontario
- Miscellaneous Personal Services, Ontario
- Miscellaneous Photographers, Ontario
- Miscellaneous Professional, Ontario
- Mobile Home Parks & Communities , Ontario
- Molds, Ontario
- Molds Manufacturers, Ontario
- Mongolian Restaurants, Ontario
- Monuments, Tombstones, Markers & Memorials, Ontario
- Mortgage Bankers & Correspondents, Ontario
- Mortgage Contracts & Services, Ontario
- Mortgages & Loans, Ontario
- Motor Vehicle, Ontario
- Motor Vehicle Rental & Leasing, Ontario
- Motorcycle & Motor Scooters Dealers, Repair & Service, Ontario
- Motorcycle Parts, Accessories & Dealers, Ontario
- Motorcycle Repair & Service, Ontario
- Moving Supplies & Equipment Rental, Ontario
- Moving Truck Rental , Ontario
- Muffler Shop & Exhaust Systems, Ontario
- Museums, Ontario
- Music, Ontario
- Music Schools, Ontario
- Musical Instrument Rental, Ontario - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Ontario
- Musical Instruments - Guitars, Ontario
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