- Machine Shop, Columbus
- Machine Shop & Tool Repair Service, Columbus
- Machinery Movers & Erectors, Columbus
- Machinery Repair & Rebuild, Columbus
- Machinery, Supplies & Equipment - Business Production Related, Columbus
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus
- Magazine & Newspaper Stands, Columbus - Dealers & Distributors
- Mailbox Rental Services, Columbus
- Mailing List Service, Brokers & Compilers, Columbus
- Mailing, Delivery & Courier Service, Columbus
- Maintenance, Cleaning & Sanitation, Columbus
- Major Appliances, Columbus - Household & Kitchen
- Make Up & Cosmetics Application, Columbus
- Malls & Shopping Centers, Columbus
- Malpractice Attorneys & Lawyers, Columbus
- Malpractice Attorneys & Lawyers, Columbus
- Malpractice Lawyers & Attorneys, Columbus
- Mammography Clinics, Columbus - Breast Cancer Screening
- Management Consultants & Services, Columbus
- Mandarin Restaurants, Columbus
- Manicurists & Pedicurists, Columbus
- Manifold Business Forms Manufacturers, Columbus
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Marble & Terrazzo Flooring - Cleaning & Service, Columbus
- Marriage & Family Counselors, Columbus
- Marriage & Family Counselors Information & Referrals, Columbus
- Martial Arts & Self Defense Schools, Columbus
- Masonry Contractors, Columbus - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Columbus
- Massage Therapists & Professional, Columbus
- Massage Therapy, Columbus
- Mastectomy Apparel, Forms, Prostheses & Supplies, Columbus
- Material Handling & Heavy Machinery & Equipment, Columbus
- Maternity Clothes & Clothing Stores, Columbus - Maternity Dress, Gown, Swimwear, Underwear & More
- Mausoleums Developers, Columbus
- Maytag Appliances, Columbus
- Meat Market, Wholesale & Products, Columbus
- Meat Packers, Columbus
- Mechanical Contractors, Columbus - Install, Service & Repair
- Medical & Dental Management, Columbus
- Medical & Health Service Organizations, Columbus
- Medical Billing Services, Columbus
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Columbus
- Medical Groups & Clinics, Columbus - Medical & Health Centers
- Medical Management & Business Administration Service, Columbus
- Medical Research, Columbus
- Medical Research & Development, Columbus - Medical Information & Research
- Medical Research Facilities, Columbus - Research & Development Centers
- Medical Supplies & Equipment, Columbus
- Meeting & Event Planning Services, Columbus - Conference Consultants
- Membership Sports & Recreation Clubs, Columbus
- Men's & Boys Clothing & Accessories Stores, Columbus
- Men's Clothing Stores, Columbus - Clothes & Accessories
- Mental Health Clinics, Columbus - Treatment Centers
- Mental Health Specialists, Columbus - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Columbus
- Merchandise Sales Events, Columbus
- Merchandising & Marketing Consultants, Columbus
- Metal Buildings, Columbus - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Columbus - Iron Works
- Metal Specialties, Columbus
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- Metal Stampings Manufacturers, Columbus
- Metal Working Machinery, Columbus
- Metaphysical Churches, Columbus
- Methodist Church, Columbus
- Metropolitan Church, Columbus
- Mexican Restaurants, Columbus
- Midwives, Columbus
- Mildew Removal & Control, Columbus - Mold Removal
- Military And Veteran Attorneys & Lawyers, Columbus
- Military And Veteran Attorneys & Lawyers, Columbus
- Military And Veteran Lawyers & Attorneys, Columbus
- Military Supplies, Columbus
- Mini & Self Storage, Columbus
- Mini Golf Courses, Columbus
- Mining, Columbus
- Ministers, Columbus
- Ministries Church, Columbus
- Mirrors, Columbus - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Columbus
- Miscellaneous Household Item Repair, Columbus
- Miscellaneous Prosthesis & Appliances, Columbus
- Miscellaneous Agriculture, Columbus
- Miscellaneous Business Services, Columbus
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Manufacturing, Columbus
- Miscellaneous Metal Work Manufacturers, Columbus
- Miscellaneous Personal Services, Columbus
- Miscellaneous Photographers, Columbus
- Miscellaneous Professional, Columbus
- Mission Churches, Columbus
- Mobile Home Parks & Communities , Columbus
- Mobile Homes for Rent & Lease, Columbus
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Money Transfer Service, Columbus
- Monuments, Tombstones, Markers & Memorials, Columbus
- Mortgage Bankers & Correspondents, Columbus
- Mortgage Companies, Columbus
- Mortgages & Loans, Columbus
- Motion Picture Pre & Post Production Services, Columbus
- Motivational & Self Improvement Schools, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Motorcycle & Motor Scooters Dealers, Repair & Service, Columbus
- Motorcycle Parts, Accessories & Dealers, Columbus
- Motorcycle Repair & Service, Columbus
- Motorcycle Wreckers, Columbus
- Movie Theaters, Columbus
- Moving & Storage Supplies & Equipment, Columbus
- Moving Companies, Columbus
- Moving Services - Labor & Material, Columbus
- Moving Supplies & Equipment Rental, Columbus
- Moving Truck Rental , Columbus
- Muffler Shop & Exhaust Systems, Columbus
- Mulch, Peat & Moss Products, Columbus
- Museums, Columbus
- Music, Columbus
- Music Lessons, Columbus
- Music Lessons - Vocal, Columbus
- Musical Instruments & Equipment Stores, Columbus
- Musical Instruments Repair, Sales & Service, Columbus
- Musical Recording Services, Columbus
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