- Machine Shop & Tool Repair Service, Cowansville
- Machinery, Supplies & Equipment - Business Production Related, Cowansville
- Machinery, Supplies & Equipment - Business Supplies Related, Cowansville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cowansville
- Mailing, Delivery & Courier Service, Cowansville
- Major Appliances, Cowansville - Household & Kitchen
- Malls & Shopping Centers, Cowansville
- Management Consultants & Services, Cowansville
- Manicurists & Pedicurists, Cowansville
- Manufacturing, Cowansville
- Manufacturing Equipment & Supplies, Cowansville
- Manufacturing Products, Cowansville
- Maple Sugar & Syrup Equipment & Accessories, Cowansville
- Maple Sugar Manufacturers Supplies, Cowansville
- Martial Arts & Self Defense Schools, Cowansville
- Masonry Contractors, Cowansville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Cowansville
- Massage Therapy, Cowansville
- Material Handling Equipment, Cowansville - Conveyor Belt, Pallet Jack, Forklift, etc
- Meals Ready To Eat Manufacturers, Cowansville
- Medical Groups & Clinics, Cowansville - Medical & Health Centers
- Medical Supplies & Equipment, Cowansville
- Meeting & Event Planning Services, Cowansville - Conference Consultants
- Membership Sports & Recreation Clubs, Cowansville
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- Mens & Womens Clothing, Cowansville
- Mental Health Specialists, Cowansville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Plating & Polishing, Cowansville
- Metal Polishing & Buffing, Cowansville
- Metal Repair Service & Blacksmith, Cowansville - Iron Works
- Metal Working Machinery, Cowansville
- Milk Bars, Cowansville
- Millwork Contractors, Cowansville
- Mini & Self Storage, Cowansville
- Mirrors, Cowansville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Cowansville
- Miscellaneous Government, Cowansville
- Miscellaneous Manufacturing, Cowansville
- Miscellaneous Personal Services, Cowansville
- Miscellaneous Professional, Cowansville
- Mobile Home Parks & Communities , Cowansville
- Motion Picture Pre & Post Production Services, Cowansville
- Motor Vehicle, Cowansville
- Motor Vehicle Rental & Leasing, Cowansville
- Movie Theaters, Cowansville
- Moving Truck Rental , Cowansville
- Music, Cowansville
- Musical Instruments & Equipment Stores, Cowansville
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