- Machine Shop, Columbia
- Machine Shop & Tool Repair Service, Columbia
- Machinery And Equipment Manufacturers, Columbia
- Machinery Repair & Rebuild, 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
- Major Appliances, Columbia - Household & Kitchen
- Malls & Shopping Centers, Columbia
- Management Consultants & Services, Columbia
- Manicurists & Pedicurists, Columbia
- Manufactured & Mobile Home Movers & Transporting, Columbia
- Manufacturing, Columbia
- Manufacturing Equipment & Supplies, Columbia
- Manufacturing Products, Columbia
- Marriage & Family Counselors, Columbia
- Martial Arts & Self Defense Schools, Columbia
- Mary Kay Cosmetics, Columbia
- Masonry Contractors, Columbia - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Columbia
- Massage Therapists & Professional, Columbia
- Massage Therapy, Columbia
- Mausoleums Developers, Columbia
- Meat Packers, Columbia
- Medical & Dental Management, Columbia
- Medical & Health Service Organizations, Columbia
- Medical Management & Business Administration Service, Columbia
- Medical Supplies & Equipment, Columbia
- Meeting & Event Planning Services, Columbia - Conference Consultants
- Membership Sports & Recreation Clubs, Columbia
- Mental Health Clinics, Columbia - Treatment Centers
- Mental Health Specialists, Columbia - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Columbia
- Metal Buildings, Columbia - Kits, Homes, Steel Buildings, etc
- Metal Lockers, Columbia
- Methodist Church, Columbia
- Mexican Restaurants, Columbia
- Mini & Self Storage, Columbia
- Mining, Columbia
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- Mining Services, Columbia
- Mirrors, Columbia - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Mirrors Manufacturers Supplies, Columbia
- Miscellaneous Business Credit Institutions & Services, Columbia
- Miscellaneous Agriculture, Columbia
- Miscellaneous Business Services, Columbia
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Columbia
- Miscellaneous Government, Columbia
- Miscellaneous Jewelry, Columbia
- Miscellaneous Manufacturing, Columbia
- Miscellaneous Personal Services, Columbia
- Miscellaneous Professional, Columbia
- Mission Churches, Columbia
- Mobile Home Parks & Communities , Columbia
- Mobile Homes for Rent & Lease, Columbia
- Modular & Mobile Homes For Sale, Columbia - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Columbia
- Mortgage Bankers & Correspondents, Columbia
- Mortgages & Loans, Columbia
- Motion Picture & Television Production Services, Columbia
- Motion Picture Pre & Post Production Services, Columbia
- Motor Sports, 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 Companies, Columbia
- Moving Supplies & Equipment Rental, Columbia
- Moving Truck Rental , Columbia
- Muffler Shop & Exhaust Systems, Columbia
- Museums, Columbia
- Music, Columbia
- Music Lessons, Columbia
- Music Lessons - Instrumental, Columbia
- Music Publishers & Distribution, Columbia
- Musical Instruments & Equipment Stores, Columbia
- Musical Recording Services, Columbia
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