- Machine Shop & Tool Repair Service, Columbia
- Machinery And Equipment Manufacturers, Columbia
- Machinery, Supplies & Equipment - Business Supplies Related, Columbia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbia
- Magazine & Newspaper Stands, Columbia - Dealers & Distributors
- Mail Delivery Service, Columbia
- Major Appliances, Columbia - Household & Kitchen
- Management Consultants & Services, Columbia
- Manicurists & Pedicurists, Columbia
- Manufacturing, Columbia
- Manufacturing Products, Columbia
- Marine Products And Services, Columbia
- Marine Repair & Service Stations, Columbia
- Marine Supplies & Equipment Repair, Columbia - Boat Supplies & Equipment
- Marriage & Family Counselors, Columbia
- Masonry Contractors, Columbia - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Columbia
- Material Handling Equipment, Columbia - Conveyor Belt, Pallet Jack, Forklift, etc
- Maytag Appliances, Columbia
- Mechanical Contractors, Columbia - Install, Service & Repair
- Medical & Dental Management, Columbia
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Columbia
- Medical Supplies & Equipment, Columbia
- Mennonite Church, Columbia
- Mental Health Specialists, Columbia - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Columbia - Message Receiving & Forwarding Service
- Metal Products, Columbia
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- Metal Stampings Manufacturers, Columbia
- Metals Corrugated, Columbia
- Methodist Church, Columbia
- Mexican Restaurants, Columbia
- Mini & Self Storage, Columbia
- Miscellaneous Household Item Repair, Columbia
- Miscellaneous Business Services, Columbia
- Miscellaneous Government, Columbia
- Miscellaneous Metal Work Manufacturers, Columbia
- Miscellaneous Personal Services, Columbia
- Miscellaneous Professional, Columbia
- Monuments, Tombstones, Markers & Memorials, Columbia
- Mortgage Bankers & Correspondents, Columbia
- Mortgages & Loans, Columbia
- Motor Vehicle, Columbia
- Motor Vehicle Rental & Leasing, Columbia
- Motorcycle Parts, Accessories & Dealers, Columbia
- Moving & Storage Supplies & Equipment, Columbia
- Moving Companies, Columbia
- Moving Truck Rental , Columbia
- Muffler Shop & Exhaust Systems, Columbia
- Museums, Columbia
- Music, Columbia
- Musical Instruments & Equipment Stores, Columbia
- Musical Instruments Repair, Sales & Service, Columbia
- Musical Recording Services, Columbia
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