- Machine Shop & Tool Repair Service, Columbia
- Machinery, Supplies & Equipment - Business Supplies Related, Columbia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbia
- Management Consultants & Services, Columbia
- Manicurists & Pedicurists, Columbia
- Manifold Business Forms Manufacturers, Columbia
- Manufacturing, Columbia
- Marinas & Marina Services, Columbia
- Marriage & Family Counselors, Columbia
- Masonry Materials & Supplies, Columbia
- Meat Packers, Columbia
- Medical Billing Services, Columbia
- Medical Supplies & Equipment, Columbia
- Membership Sports & Recreation Clubs, Columbia
- Mental Health Clinics, Columbia - Treatment Centers
- Mental Health Specialists, Columbia - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Columbia
- Methodist Church, Columbia
- Mexican Restaurants, Columbia
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- Ministries Church, Columbia
- Miscellaneous Business Services, Columbia
- Miscellaneous Government, Columbia
- Miscellaneous Industry, Columbia
- Miscellaneous Personal Services, Columbia
- Miscellaneous Photographers, Columbia
- Modular & Mobile Homes For Sale, Columbia - Manufactured Homes Sale & Service
- Money Transfer Service, Columbia
- Monuments, Tombstones, Markers & Memorials, Columbia
- Mortgage Bankers & Correspondents, Columbia
- Mortgage Companies, Columbia
- Motor Vehicle, Columbia
- Motor Vehicle Rental & Leasing, Columbia
- Motorcycle & ATV Repair & Service, Columbia
- Motorcycle Parts, Accessories & Dealers, Columbia
- Motorcycle Repair & Service, Columbia
- Moving Truck Rental , Columbia
- Music, Columbia
- Musical Recording Services, Columbia
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