- Machine Shop & Tool Repair Service, Columbus
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus
- Mail Delivery Service, Columbus
- Management Consultants & Services, Columbus
- Manicurists & Pedicurists, Columbus
- Manufacturing, Columbus
- Maps & Globes, Columbus
- Medical Supplies & Equipment, Columbus
- Membership Sports & Recreation Clubs, Columbus
- Mental Health Clinics, Columbus - Treatment Centers
- Mental Health Specialists, Columbus - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Columbus
- Metal Buildings, Columbus - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Columbus
- Miscellaneous Household Item Repair, Columbus
- Miscellaneous Business Services, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Manufacturing, Columbus
- Miscellaneous Personal Services, Columbus
- Miscellaneous Photographers, Columbus
- Miscellaneous Professional, Columbus
- Mortgage Bankers & Correspondents, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Moving Truck Rental , Columbus
- Museums, Columbus
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