- Machine Shop & Tool Repair Service, Mechanicville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mechanicville
- Management Consultants & Services, Mechanicville
- Manicurists & Pedicurists, Mechanicville
- Manufacturing, Mechanicville
- Marriage & Family Counselors, Mechanicville
- Medical Diagnostic Clinics, Mechanicville - Clinical Labs & Centers
- Mental Health Specialists, Mechanicville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Mechanicville
- Mini & Self Storage, Mechanicville
- Miscellaneous Agriculture, Mechanicville
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- Miscellaneous Government, Mechanicville
- Miscellaneous Manufacturing, Mechanicville
- Miscellaneous Professional, Mechanicville
- Mortgage Bankers & Correspondents, Mechanicville
- Motor Vehicle, Mechanicville
- Motor Vehicle Rental & Leasing, Mechanicville
- Motorcycle Parts, Accessories & Dealers, Mechanicville
- Moving Supplies & Equipment Rental, Mechanicville
- Moving Truck Rental , Mechanicville
- Music, Mechanicville
- Musical Instruments Repair, Sales & Service, Mechanicville
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