- Machinery, Supplies & Equipment - Business Production Related, Columbus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus
- Mailing, Delivery & Courier Service, Columbus
- Major Appliance Repair & Service, Columbus
- Management Consultants & Services, Columbus
- Manicurists & Pedicurists, Columbus
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Masonry Contractors, Columbus - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Columbus
- Meat Market, Wholesale & Products, Columbus
- Medical Diagnostic Clinics, Columbus - Clinical Labs & Centers
- Merchandise Sales Events, Columbus
- Methodist Church, Columbus
- Millwork Contractors, Columbus
- Mini & Self Storage, Columbus
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- Miscellaneous Household Item Repair, Columbus
- Miscellaneous Business Services, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Personal Services, Columbus
- Miscellaneous Professional, Columbus
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Columbus
- Motion Picture Pre & Post Production Services, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Moving Companies, Columbus
- Moving Truck Rental , Columbus
- Music, Columbus
- Musical Instrument Rental, Columbus - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Columbus
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