- Machine Shop, Columbus
- Machinery, Supplies & Equipment - Business Production Related, Columbus
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus
- Major Appliances, Columbus - Household & Kitchen
- Management Consultants & Services, Columbus
- Manicurists & Pedicurists, Columbus
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Martial Arts & Self Defense Schools, Columbus
- Masonry Contractors, Columbus - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Columbus
- Medical Supplies & Equipment, Columbus
- Metal Repair Service & Blacksmith, Columbus - Iron Works
- Methodist Church, Columbus
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- Mexican Restaurants, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Industry, Columbus
- Miscellaneous Personal Services, Columbus
- Miscellaneous Photographers, Columbus
- Miscellaneous Professional, Columbus
- Mission Churches, Columbus
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Motorcycle & Motor Scooters Dealers, Repair & Service, Columbus
- Motorcycle Repair & Service, Columbus
- Moving Supplies & Equipment Rental, Columbus
- Moving Truck Rental , Columbus
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