- Machine Shop & Tool Repair Service, Stamford
- Machinery, Supplies & Equipment - Business Production Related, Stamford
- Machinery, Supplies & Equipment - Business Supplies Related, Stamford
- Major Appliances, Stamford - Household & Kitchen
- Manufacturing, Stamford
- Medical Supplies & Equipment, Stamford
- Mental Health Clinics, Stamford - Treatment Centers
- Mental Health Specialists, Stamford - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Stamford
- Mexican Restaurants, Stamford
- Miscellaneous Government, Stamford
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- Miscellaneous Photographers, Stamford
- Miscellaneous Professional, Stamford
- Monuments, Tombstones, Markers & Memorials, Stamford
- Mortgage Bankers & Correspondents, Stamford
- Mortgage Companies, Stamford
- Motor Vehicle, Stamford
- Motor Vehicle Rental & Leasing, Stamford
- Moving Supplies & Equipment Rental, Stamford
- Moving Truck Rental , Stamford
- Museums, Stamford
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