- Machine Shop & Tool Repair Service, Putnam Valley
- Machinery, Supplies & Equipment - Business Production Related, Putnam Valley
- Machinery, Supplies & Equipment - Business Supplies Related, Putnam Valley
- Machinery, Supplies & Equipment - Construction & Contractor Related, Putnam Valley
- Major Appliances, Putnam Valley - Household & Kitchen
- Mammography Clinics, Putnam Valley - Breast Cancer Screening
- Management Consultants & Services, Putnam Valley
- Manicurists & Pedicurists, Putnam Valley
- Manufacturing, Putnam Valley
- Manufacturing Products, Putnam Valley
- Marriage & Family Counselors, Putnam Valley
- Masonry Contractors, Putnam Valley - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Putnam Valley
- Mechanical Contractors, Putnam Valley - Install, Service & Repair
- Medical Records Service , Putnam Valley
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- Messenger Service, Putnam Valley - Message Receiving & Forwarding Service
- Metal Buildings, Putnam Valley - Kits, Homes, Steel Buildings, etc
- Methodist Church, Putnam Valley
- Mini & Self Storage, Putnam Valley
- Miscellaneous Business Product Repair, Putnam Valley
- Miscellaneous Business Services, Putnam Valley
- Miscellaneous Government, Putnam Valley
- Miscellaneous Personal Services, Putnam Valley
- Miscellaneous Professional, Putnam Valley
- Monuments, Tombstones, Markers & Memorials, Putnam Valley
- Motor Vehicle, Putnam Valley
- Moving Companies, Putnam Valley
- Museums, Putnam Valley
- Musical Instruments Repair, Sales & Service, Putnam Valley
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