- Machine Shop & Tool Repair Service, Monson
- Machinery, Supplies & Equipment - Construction & Contractor Related, Monson
- Major Appliances, Monson - Household & Kitchen
- Management Consultants & Services, Monson
- Manufacturing, Monson
- Marriage & Family Counselors, Monson
- Masonry Contractors, Monson - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Monson
- Massage Therapy, Monson
- Mechanical Engineer, Monson - Mechanical Engineering Service
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- Metal Roofs, Monson
- Metal Specialties, Monson
- Metaphysical Churches, Monson
- Methodist Church, Monson
- Miscellaneous Professional, Monson
- Model Trains, Monson
- Mortgage Bankers & Correspondents, Monson
- Mortgage Service Bureaus, Monson
- Motor Vehicle, Monson
- Motorcycle Driving School, Monson
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