- Machine Shop & Tool Repair Service, Port Colborne
- Machinery And Equipment Manufacturers, Port Colborne
- Machinery, Supplies & Equipment - Business Production Related, Port Colborne
- Machinery, Supplies & Equipment - Business Supplies Related, Port Colborne
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Colborne
- Mailing, Delivery & Courier Service, Port Colborne
- Major Appliances, Port Colborne - Household & Kitchen
- Management Consultants & Services, Port Colborne
- Manicurists & Pedicurists, Port Colborne
- Manufacturing, Port Colborne
- Manufacturing Products, Port Colborne
- Marinas & Marina Services, Port Colborne
- Marine Contractors & Designers, Port Colborne
- Marine Supplies & Equipment, Port Colborne - Boat Supplies
- Martial Arts & Self Defense Schools, Port Colborne
- Masonry Contractors, Port Colborne - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Port Colborne
- Massage Therapists & Professional, Port Colborne
- Massage Therapy, Port Colborne
- Medical & Health Service Organizations, Port Colborne
- Medical Alert Systems, Port Colborne - Medical Alarms - PERS
- Medical Supplies & Equipment, Port Colborne
- Membership Sports & Recreation Clubs, Port Colborne
- Mental Health Specialists, Port Colborne - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Port Colborne - Iron Works
- Metal Specialties, Port Colborne
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- Metal Tanks, Port Colborne
- Mexican Restaurants, Port Colborne
- Mini & Self Storage, Port Colborne
- Mining, Port Colborne
- Miscellaneous Government, Port Colborne
- Miscellaneous Manufacturing, Port Colborne
- Miscellaneous Personal Services, Port Colborne
- Miscellaneous Professional, Port Colborne
- Mission Churches, Port Colborne
- Molds Manufacturers, Port Colborne
- Money Transfer Service, Port Colborne
- Monuments, Tombstones, Markers & Memorials, Port Colborne
- Mortgage Bankers & Correspondents, Port Colborne
- Mortgage Brokers, Port Colborne
- Motor Vehicle, Port Colborne
- Motor Vehicle Rental & Leasing, Port Colborne
- Motorcycle Parts, Accessories & Dealers, Port Colborne
- Moving Companies, Port Colborne
- Moving Truck Rental , Port Colborne
- Muffler Shop & Exhaust Systems, Port Colborne
- Museums, Port Colborne
- Music, Port Colborne
- Music Lessons, Port Colborne
- Music Lessons - Instrumental, Port Colborne
- Musical Instruments & Equipment Stores, Port Colborne
- Musical Recording Services, Port Colborne
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