- Machine Shop & Tool Repair Service, Waterloo
- Machinery, Supplies & Equipment - Business Production Related, Waterloo
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waterloo
- Major Appliances, Waterloo - Household & Kitchen
- Management Consultants & Services, Waterloo
- Manufacturing, Waterloo
- Manufacturing Equipment & Supplies, Waterloo
- Manufacturing Products, Waterloo
- Maple Sugar & Syrup Equipment & Accessories, Waterloo
- Maple Sugar Manufacturers Supplies, Waterloo
- Masonry Materials & Supplies, Waterloo
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- Massage Therapy, Waterloo
- Medical Supplies & Equipment, Waterloo
- Mental Health Specialists, Waterloo - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Plating & Polishing, Waterloo
- Metal Polishing & Buffing, Waterloo
- Milk & Milk Products, Waterloo
- Miscellaneous Agriculture, Waterloo
- Miscellaneous Professional, Waterloo
- Motor Vehicle, Waterloo
- Music, Waterloo
- Musical Recording Services, Waterloo
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