- Machine Shop, Columbia
- Machine Shop & Tool Repair Service, Columbia
- Machinery, Supplies & Equipment - Business Production Related, Columbia
- Major Appliances, Columbia - Household & Kitchen
- Management Consultants & Services, Columbia
- Manufacturing, Columbia
- Manufacturing Products, Columbia
- Marriage & Family Counselors, Columbia
- Mental Health Clinics, Columbia - Treatment Centers
- Mental Health Specialists, Columbia - Psychologist, Psychiatrist, Psychotherapist, etc
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- Mini & Self Storage, Columbia
- Miscellaneous Personal Services, Columbia
- Mortgage Bankers & Correspondents, Columbia
- Motor Vehicle, Columbia
- Motor Vehicle Rental & Leasing, Columbia
- Motorcycle Parts, Accessories & Dealers, Columbia
- Motorcycle Repair & Service, Columbia
- Motorcycles Paint & Refinishing, Columbia
- Moving Truck Rental , Columbia
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