- Machine Shop, Welland
- Machine Shop & Tool Repair Service, Welland
- Machinery And Equipment Manufacturers, Welland
- Machinery Custom Design Manufacturers, Welland
- Machinery, Supplies & Equipment - Business Production Related, Welland
- Machinery, Supplies & Equipment - Business Supplies Related, Welland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Welland
- Magazine & Newspaper Stands, Welland - Dealers & Distributors
- Mail Receiving & Forwarding Service, Welland
- Mailing, Delivery & Courier Service, Welland
- Maintenance, Cleaning & Sanitation, Welland
- Major Appliances, Welland - Household & Kitchen
- Malls & Shopping Centers, Welland
- Management Consultants & Services, Welland
- Manicurists & Pedicurists, Welland
- Manufacturers Agents & Representatives, Welland
- Manufacturers Representative, Welland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Welland
- Manufacturing & Industrial Consultants, Welland
- Manufacturing Products, Welland
- Marriage & Family Counselors, Welland
- Martial Arts & Self Defense Schools, Welland
- Masonry Contractors, Welland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Welland
- Massage Therapists & Professional, Welland
- Massage Therapy, Welland
- Material Handling Equipment, Welland - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, Welland
- Meat Packers, Welland
- Medical Supplies & Equipment, Welland
- Membership Sports & Recreation Clubs, Welland
- Men's & Boys Clothing & Accessories Stores, Welland
- Men's Clothing Stores, Welland - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Welland
- Mens & Womens Clothing, Welland
- Mental Health Specialists, Welland - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Welland - Kits, Homes, Steel Buildings, etc
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- Metal Repair Service & Blacksmith, Welland - Iron Works
- Metal Tanks, Welland
- Methodist Church, Welland
- Midwives, Welland
- Mildew Removal & Control, Welland - Mold Removal
- Mini & Self Storage, Welland
- Mirrors, Welland - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Welland
- Miscellaneous Household Item Repair, Welland
- Miscellaneous Agriculture, Welland
- Miscellaneous Business Services, Welland
- Miscellaneous Government, Welland
- Miscellaneous Industry, Welland
- Miscellaneous Manufacturing, Welland
- Miscellaneous Personal Services, Welland
- Miscellaneous Photographers, Welland
- Miscellaneous Professional, Welland
- Mission Churches, Welland
- Money Transfer Service, Welland
- Monuments, Tombstones, Markers & Memorials, Welland
- Mopeds & Motor Scooters Rental, Welland
- Mortgage Bankers & Correspondents, Welland
- Mortgage Brokers, Welland
- Motion Picture Pre & Post Production Services, Welland
- Motor Vehicle, Welland
- Motor Vehicle Rental & Leasing, Welland
- Motorcycle Parts, Accessories & Dealers, Welland
- Moving Companies, Welland
- Moving Truck Rental , Welland
- Muffler Shop & Exhaust Systems, Welland
- Museums, Welland
- Music, Welland
- Music Lessons, Welland
- Music Lessons - Instrumental, Welland
- Music Lessons - Vocal, Welland
- Musical Instruments & Equipment Stores, Welland
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