- Machine Shop & Tool Repair Service, Columbus Grove
- Machinery And Equipment Manufacturers, Columbus Grove
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus Grove
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus Grove
- Management Consultants & Services, Columbus Grove
- Manufacturing, Columbus Grove
- Manufacturing Products, Columbus Grove
- Mental Health Specialists, Columbus Grove - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Plating & Polishing, Columbus Grove
- Methodist Church, Columbus Grove
- Miscellaneous Agriculture, Columbus Grove
- Miscellaneous Government, Columbus Grove
- Miscellaneous Photographers, Columbus Grove
- Miscellaneous Professional, Columbus Grove
- Monuments, Tombstones, Markers & Memorials, Columbus Grove
- Motor Vehicle, Columbus Grove
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