- Machine Shop, Columbia
- 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
- Magazine & Newspaper Stands, Columbia - Dealers & Distributors
- Mailbox Rental Services, Columbia
- Mailboxes Retail, Columbia
- Mailing, Delivery & Courier Service, Columbia
- Maintenance, Cleaning & Sanitation, Columbia
- Major Appliances, Columbia - Household & Kitchen
- Make Up & Cosmetics Application, Columbia
- Malls & Shopping Centers, Columbia
- Malpractice Attorneys & Lawyers, Columbia
- Malpractice Attorneys & Lawyers, Columbia
- Malpractice Lawyers & Attorneys, Columbia
- Management Consultants & Services, Columbia
- Management Training & Development, Columbia
- Manicurists & Pedicurists, Columbia
- Manufacturers Agents & Representatives, Columbia
- Manufacturers Representative, Columbia - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Columbia
- Manufacturing & Industrial Consultants, Columbia
- Manufacturing Products, Columbia
- Map Publishers & Printers, Columbia
- Mapping & Topographical Services, Columbia
- Market Research & Analysis , Columbia - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Columbia
- Marriage & Family Counselors, Columbia
- Martial Arts & Self Defense Schools, Columbia
- Masonry Contractors, Columbia - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Columbia
- Masonry Materials & Supplies, Columbia
- Massage Therapists & Professional, Columbia
- Massage Therapy, Columbia
- Massage Therapy Relaxation, Columbia
- Maternity Clothes & Clothing Stores, Columbia - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Columbia
- Mechanical Contractors, Columbia - Install, Service & Repair
- Mechanical Engineer, Columbia - Mechanical Engineering Service
- Medical & Dental Management, Columbia
- Medical & Health Service Organizations, Columbia
- Medical Artificial Organs & Supplies, Columbia
- Medical Diagnostic Clinics, Columbia - Clinical Labs & Centers
- Medical Equipment Manufacturers, Columbia
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Columbia
- Medical Groups & Clinics, Columbia - Medical & Health Centers
- Medical Management & Business Administration Service, Columbia
- Medical Research, Columbia
- Medical Research & Development, Columbia - Medical Information & Research
- Medical Supplies & Equipment, Columbia
- Mediterranean Restaurants, Columbia
- Membership Sports & Recreation Clubs, Columbia
- Men's & Boys Clothing & Accessories Stores, Columbia
- Men's Clothing Stores, Columbia - Clothes & Accessories
- Men's Shoe Stores, Columbia
- Mental Health Clinics, Columbia - Treatment Centers
- Mental Health Specialists, Columbia - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandising & Pricing Equipment, Columbia
- Methodist Church, Columbia
- Mexican Restaurants, Columbia
- Microfilm & Imaging Service, Equipment & Supplies , Columbia
- Middle Eastern Restaurants, Columbia
- Midwives, Columbia
- Mildew Removal & Control, Columbia - Mold Removal
- Millwork Contractors, Columbia
- Mini & Self Storage, Columbia
- Mining, Columbia
- Mining Contractors, Columbia - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Columbia - Mining Companies
- Miscellaneous Business Credit Institutions & Services, Columbia
- Miscellaneous Business Manufacturing, Columbia
- Miscellaneous Business Product Repair, Columbia
- Miscellaneous Household Item Repair, Columbia
- Miscellaneous Agriculture, Columbia
- Miscellaneous Business Services, Columbia
- Miscellaneous Government, Columbia
- Miscellaneous Industry, Columbia
- Miscellaneous Manufacturing, Columbia
- Miscellaneous Personal Services, Columbia
- Miscellaneous Photographers, Columbia
- Miscellaneous Professional, Columbia
- Modeling & Talent Agencies, Columbia
- Modular & Mobile Homes For Sale, Columbia - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Columbia
- Money Transfer Service, Columbia
- Mortgage Bankers & Correspondents, Columbia
- Mortgage Companies, Columbia
- Mortgage Contracts & Services, Columbia
- Mortgages & Loans, Columbia
- Mortgages Commercial & Industrial, Columbia
- Motion Picture & Television Production Services, Columbia
- Motion Picture Dists & Producers, Columbia
- Motion Picture Pre & Post Production Services, Columbia
- Motor Vehicle, Columbia
- Motor Vehicle Rental & Leasing, Columbia
- Mountain & Ice Climbing Tours, Columbia
- Movie Theaters, Columbia
- Moving & Storage Consultants, Columbia
- Moving & Storage Supplies & Equipment, Columbia
- Moving Companies, Columbia
- Moving Services - Labor & Material, Columbia
- Moving Supplies & Equipment Rental, Columbia
- Moving Truck Rental , Columbia
- Muffler Shop & Exhaust Systems, Columbia
- Museums, Columbia
- Music, Columbia
- Music Entertainment, Columbia
- Music Lessons, Columbia
- Music Lessons - Instrumental, Columbia
- Music Lessons - Vocal, Columbia
- Music Schools, Columbia
- Musical Instrument Rental, Columbia - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Columbia
- Musical Instruments Repair, Sales & Service, Columbia
- Musicians, Bands & Disc Jockeys, Columbia
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