- Machine Shop & Tool Repair Service, Stouffville
- Machine Tool Repair & Rebuild, Stouffville
- Machinery, Supplies & Equipment - Business Production Related, Stouffville
- Machinery, Supplies & Equipment - Business Supplies Related, Stouffville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Stouffville
- Magazine & Newspaper Stands, Stouffville - Dealers & Distributors
- Mailboxes Retail, Stouffville
- Maintenance, Cleaning & Sanitation, Stouffville
- Major Appliances, Stouffville - Household & Kitchen
- Management Consultants & Services, Stouffville
- Manicurists & Pedicurists, Stouffville
- Manufactured & Mobile Home Movers & Transporting, Stouffville
- Manufacturing, Stouffville
- Manufacturing Products, Stouffville
- Marketing Schools, Stouffville
- Marriage & Family Counselors, Stouffville
- Martial Arts & Self Defense Schools, Stouffville
- Masonry Contractors, Stouffville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Stouffville
- Massage Therapists & Professional, Stouffville
- Massage Therapy, Stouffville
- Meat Market, Wholesale & Products, Stouffville
- Medical Supplies & Equipment, Stouffville
- Membership Sports & Recreation Clubs, Stouffville
- Mennonite Church, Stouffville
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- Mens & Womens Clothing, Stouffville
- Merchandise Sales Events, Stouffville
- Metal Repair Service & Blacksmith, Stouffville - Iron Works
- Mexican Restaurants, Stouffville
- Middle Eastern Restaurants, Stouffville
- Mildew Removal & Control, Stouffville - Mold Removal
- Mini & Self Storage, Stouffville
- Mining Equipment & Supplies, Stouffville
- Miscellaneous Household Item Repair, Stouffville
- Miscellaneous Agriculture, Stouffville
- Miscellaneous Government, Stouffville
- Miscellaneous Personal Services, Stouffville
- Miscellaneous Photographers, Stouffville
- Miscellaneous Professional, Stouffville
- Mission Churches, Stouffville
- Modular & Mobile Homes For Sale, Stouffville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Stouffville
- Mortgage Bankers & Correspondents, Stouffville
- Mortgage Brokers, Stouffville
- Motion Picture Pre & Post Production Services, Stouffville
- Motivational & Self Improvement Schools, Stouffville
- Motor Vehicle, Stouffville
- Motor Vehicle Rental & Leasing, Stouffville
- Moving Companies, Stouffville
- Moving Truck Rental , Stouffville
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