- Machine Shop & Tool Repair Service, Plentywood
- Machinery, Supplies & Equipment - Business Production Related, Plentywood
- Machinery, Supplies & Equipment - Business Supplies Related, Plentywood
- Machinery, Supplies & Equipment - Construction & Contractor Related, Plentywood
- Major Appliances, Plentywood - Household & Kitchen
- Management Consultants & Services, Plentywood
- Manufacturing, Plentywood
- Manufacturing Products, Plentywood
- Masonry Materials & Supplies, Plentywood
- Medical Groups & Clinics, Plentywood - Medical & Health Centers
- Mental Health Clinics, Plentywood - Treatment Centers
- Mental Health Specialists, Plentywood - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Plentywood
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- Millwork Contractors, Plentywood
- Mining, Plentywood
- Miscellaneous Business Product Repair, Plentywood
- Miscellaneous Business Services, Plentywood
- Miscellaneous Government, Plentywood
- Miscellaneous Professional, Plentywood
- Mortgage Bankers & Correspondents, Plentywood
- Mortgage Contracts & Services, Plentywood
- Motor Vehicle, Plentywood
- Motor Vehicle Rental & Leasing, Plentywood
- Movie Theaters, Plentywood
- Moving Supplies & Equipment Rental, Plentywood
- Moving Truck Rental , Plentywood
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