- Machine Shop & Tool Repair Service, Dundas
- Machinery Repair & Rebuild, Dundas
- Machinery, Supplies & Equipment - Business Production Related, Dundas
- Machinery, Supplies & Equipment - Business Supplies Related, Dundas
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dundas
- Magazine & Newspaper Stands, Dundas - Dealers & Distributors
- Mailing, Delivery & Courier Service, Dundas
- Management Consultants & Services, Dundas
- Manicurists & Pedicurists, Dundas
- Manufacturing, Dundas
- Manufacturing Products, Dundas
- Marriage & Family Counselors, Dundas
- Martial Arts & Self Defense Schools, Dundas
- Masonry Materials & Supplies, Dundas
- Massage Therapists & Professional, Dundas
- Massage Therapy, Dundas
- Meat Packers, Dundas
- Medical Research Facilities, Dundas - Research & Development Centers
- Medical Supplies & Equipment, Dundas
- Membership Sports & Recreation Clubs, Dundas
- Men's Clothing Stores, Dundas - Clothes & Accessories
- Mental Health Specialists, Dundas - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Dundas - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Dundas - Iron Works
- Middle Eastern Restaurants, Dundas
- Millwrights, Dundas
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- Mini & Self Storage, Dundas
- Miscellaneous Agriculture, Dundas
- Miscellaneous Government, Dundas
- Miscellaneous Industry, Dundas
- Miscellaneous Manufacturing, Dundas
- Miscellaneous Personal Services, Dundas
- Miscellaneous Photographers, Dundas
- Miscellaneous Professional, Dundas
- Monuments, Tombstones, Markers & Memorials, Dundas
- Mortgage Bankers & Correspondents, Dundas
- Mortgage Brokers, Dundas
- Mortgage Companies, Dundas
- Motor Vehicle, Dundas
- Motor Vehicle Rental & Leasing, Dundas
- Moving Companies, Dundas
- Moving Truck Rental , Dundas
- Muffler Shop & Exhaust Systems, Dundas
- Museums, Dundas
- Music, Dundas
- Music Entertainment, Dundas
- Music Lessons, Dundas
- Music Lessons - Instrumental, Dundas
- Musical Instruments Repair, Sales & Service, Dundas
- Musical Recording Services, Dundas
- Musicians, Bands & Disc Jockeys, Dundas
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