- Machine Shop & Tool Repair Service, Montmagny
- Machinery Movers & Erectors, Montmagny
- Machinery, Supplies & Equipment - Business Production Related, Montmagny
- Machinery, Supplies & Equipment - Business Supplies Related, Montmagny
- Machinery, Supplies & Equipment - Construction & Contractor Related, Montmagny
- Magazine & Newspaper Stands, Montmagny - Dealers & Distributors
- Major Appliances, Montmagny - Household & Kitchen
- Malls & Shopping Centers, Montmagny
- Management Consultants & Services, Montmagny
- Manufacturing, Montmagny
- Manufacturing Products, Montmagny
- Marine Supplies & Equipment, Montmagny - Boat Supplies
- Masonry Materials & Supplies, Montmagny
- Massage Therapy, Montmagny
- Mastectomy Apparel, Forms, Prostheses & Supplies, Montmagny
- Meals Ready To Eat Manufacturers, Montmagny
- Mechanical Contractors, Montmagny - Install, Service & Repair
- Medical Groups & Clinics, Montmagny - Medical & Health Centers
- Medical Supplies & Equipment, Montmagny
- Membership Sports & Recreation Clubs, Montmagny
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- Men's Clothing Stores, Montmagny - Clothes & Accessories
- Mental Health Specialists, Montmagny - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Montmagny - Iron Works
- Mirrors, Montmagny - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Montmagny
- Miscellaneous Industry, Montmagny
- Miscellaneous Professional, Montmagny
- Modular & Mobile Homes For Sale, Montmagny - Manufactured Homes Sale & Service
- Modular Buildings, Montmagny - Modular Homes Buildings & Offices
- Mortgages & Loans, Montmagny
- Motor Vehicle, Montmagny
- Motor Vehicle Rental & Leasing, Montmagny
- Motorcycle Parts, Accessories & Dealers, Montmagny
- Museums, Montmagny
- Music, Montmagny
- Music Lessons, Montmagny
- Music Lessons - Instrumental, Montmagny
- Musical Instrument Manufacturers, Montmagny
- Musical Instruments & Equipment Stores, Montmagny
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