- Machine Shop & Tool Repair Service, Columbia
- Machinery, Supplies & Equipment - Business Production Related, Columbia
- Machinery, Supplies & Equipment - Business Supplies Related, Columbia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbia
- Mailbox Rental Services, Columbia
- Mailing, Delivery & Courier Service, Columbia
- Major Appliances, Columbia - Household & Kitchen
- Malls & Shopping Centers, Columbia
- Management Consultants & Services, Columbia
- Manicurists & Pedicurists, Columbia
- Manufacturing, Columbia
- Masonry Materials & Supplies, Columbia
- Massage Therapy, 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
- Merle Norman Cosmetics, Columbia
- Metal Buildings, Columbia - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Columbia - Iron Works
- Methodist Church, Columbia
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- Mexican Restaurants, Columbia
- Mining, Columbia
- Ministries Church, Columbia
- Miscellaneous Business Product Repair, Columbia
- Miscellaneous Agriculture, Columbia
- Miscellaneous Business Services, Columbia
- Miscellaneous Government, Columbia
- Miscellaneous Photographers, Columbia
- Miscellaneous Professional, Columbia
- Mission Churches, Columbia
- Monuments, Tombstones, Markers & Memorials, Columbia
- Mortgage Bankers & Correspondents, Columbia
- Motor Vehicle, Columbia
- Motor Vehicle Rental & Leasing, Columbia
- Motorcycle & Motor Scooters Dealers, Repair & Service, Columbia
- Motorcycle Parts, Accessories & Dealers, Columbia
- Motorcycle Repair & Service, Columbia
- Movie Theaters, Columbia
- Moving & Storage Supplies & Equipment, Columbia
- Moving Truck Rental , Columbia
- Muffler Shop & Exhaust Systems, Columbia
- Museums, Columbia
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