- Machine Shop, Columbus
- Machine Shop & Tool Repair Service, Columbus
- Machine Shop Rotary Surface Grinding, Columbus - Tool Grinding & Sharpening
- Machine Shops Slings, Columbus
- Machine Tool Repair & Rebuild, Columbus
- Machine Tools , Columbus
- Machine Tools Manufacturers Metal Cutting Types, Columbus
- Machinery And Equipment Manufacturers, Columbus
- Machinery Installation Equipment & Supplies, Columbus
- Machinery Movers & Erectors, 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
- Magazine Ads, Columbus - Periodical Advertising
- Magazine Printing & Publishing, Columbus
- Magicians & Hypnotist Entertainers, Columbus
- Magicians & Jugglers Equipment & Supplies, Columbus
- Magnetic Devices, Columbus
- Magnets & Magnetic Devices, Columbus
- Mail Boxes Manufacturers, Columbus
- Mail Delivery Service, Columbus
- Mailbox Rental Services, Columbus
- Mailboxes Retail, Columbus
- Mailing, Delivery & Courier Service, Columbus
- Maintenance, Cleaning & Sanitation, Columbus
- Major Appliances, Columbus - Household & Kitchen
- 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
- Management Training & Development, Columbus
- Manicurists & Pedicurists, Columbus
- Manifold Business Forms Manufacturers, Columbus
- Manufacturers Agents & Representatives, Columbus
- Manufacturers Representative, Columbus - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Columbus
- Manufacturing & Industrial Consultants, Columbus
- Manufacturing Equipment & Supplies, Columbus
- Manufacturing Products, Columbus
- Manufacturing Services, Columbus
- Maps & Supplies, Columbus
- Marble, Columbus
- Marine Supplies & Equipment, Columbus - Boat Supplies
- Market Research & Analysis , Columbus - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Columbus
- Marketing Schools, Columbus
- Marking Devices Manufacturers, Columbus
- Marriage & Family Counselors, Columbus
- Marriage Officiant, 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
- Massage Therapy Relaxation, Columbus
- Mastectomy Apparel, Forms, Prostheses & Supplies, Columbus
- Material Handling, Columbus
- Material Handling & Heavy Machinery & Equipment, Columbus
- Material Handling Consultants, Columbus
- Material Handling Equipment, Columbus - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Columbus - Maternity Dress, Gown, Swimwear, Underwear & More
- Maternity Services, Columbus
- Mats & Matting, Columbus
- Mausoleums Developers, Columbus
- Maytag Appliances, Columbus
- Meals Ready To Eat Manufacturers, Columbus
- Measuring Equipment, Columbus
- Meat Market, Wholesale & Products, Columbus
- Meat Packers, Columbus
- Mechanical Contractors, Columbus - Install, Service & Repair
- Mechanical Engineer, Columbus - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Columbus
- Medical & Dental Management, Columbus
- Medical & Health Service Organizations, Columbus
- Medical & Infectious Waste Disposal, Columbus
- Medical Alert Systems, Columbus - Medical Alarms - PERS
- Medical Billing Services, Columbus
- Medical Business Management Services, Columbus
- Medical Claims Processing & Assistance, Columbus
- Medical Diagnostic Clinics, Columbus - Clinical Labs & Centers
- Medical Equipment & Supplies Rental & Leasing, Columbus
- Medical Equipment Manufacturers, Columbus
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Columbus
- Medical Groups & Clinics, Columbus - Medical & Health Centers
- Medical Identification Jewelry, Columbus
- Medical Management & Business Administration Service, Columbus
- Medical Massage, Columbus
- Medical Research, Columbus
- Medical Research & Development, Columbus - Medical Information & Research
- Medical Supplies & Equipment, Columbus
- Medical Transcription Service, Columbus
- Mediterranean Restaurants, Columbus
- Meeting & Event Planning Services, Columbus - Conference Consultants
- Membership Organizations, Columbus
- Membership Sports & Recreation Clubs, Columbus
- Men's & Boys Clothing & Accessories Stores, Columbus
- Men's Clothing Stores, Columbus - Clothes & Accessories
- Men's Shoe Stores, Columbus
- Mennonite Church, Columbus
- Mens & Boys Jeans & Western Wear Stores, Columbus
- 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
- Merchandising & Pricing Equipment, Columbus
- Merle Norman Cosmetics, Columbus
- Messianic Synagogues, Columbus
- Metal Boxes & Containers, Columbus
- Metal Buildings, Columbus - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Columbus
- Metal Cutting Machines, Columbus
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- Metal Detecting Equipment, Columbus
- Metal Etching, Columbus
- Metal Finishers, Columbus
- Metal Finishing Equipment & Supplies, Columbus
- Metal Galvanizing, Columbus
- Metal Heat Treating, Columbus
- Metal Plating & Polishing, Columbus
- Metal Repair Service & Blacksmith, Columbus - Iron Works
- Metal Roofs, Columbus
- Metal Specialties, Columbus
- Metal Spinning Manufacturers, Columbus
- Metal Stampings Manufacturers, Columbus
- Metal Tanks, Columbus
- Metal Working Machinery, Columbus
- Metaphysical Churches, Columbus
- Methodist Church, Columbus
- Mexican & Latin American Goods & Products Stores, Columbus
- Mexican Food, Columbus
- Mexican Restaurants, Columbus
- Michelin Tires, Columbus - Dealers
- Microfilm & Imaging Service, Equipment & Supplies , Columbus
- Middle Eastern Restaurants, Columbus
- Mildew Removal & Control, Columbus - Mold Removal
- Military Supplies, Columbus
- Millwork Contractors, Columbus
- Millwork Manufacturers, Columbus
- Mind-Body Massage, Columbus
- Mini & Self Storage, Columbus
- Mini Golf Courses, Columbus
- Mining, Columbus
- Mining Contractors, Columbus - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Columbus
- Mining Services, Columbus
- Mining, Crude-Oil Production, Columbus - Mining Companies
- Ministers, Columbus
- Ministries Church, Columbus
- Mirrors, Columbus - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Columbus
- Miscellaneous Business Manufacturing, Columbus
- Miscellaneous Business Product Repair, Columbus
- Miscellaneous Household Item Repair, Columbus
- Miscellaneous Prosthesis & Appliances, Columbus
- Miscellaneous Retail Stores, Columbus
- Miscellaneous Agriculture, Columbus
- Miscellaneous Business Services, Columbus
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Industry, Columbus
- Miscellaneous Jewelry, Columbus
- Miscellaneous Manufacturing, Columbus
- Miscellaneous Metal Work Manufacturers, Columbus
- Miscellaneous Personal Services, Columbus
- Miscellaneous Photographers, Columbus
- Miscellaneous Professional, Columbus
- Mission Churches, Columbus
- Mitsubishi Truck Dealers, Columbus
- Mobile Automobile Services, Columbus
- Mobile Home Parks & Communities , Columbus
- Model Trains, Columbus
- Modeling & Talent Agencies, Columbus
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Molds, Columbus
- Money Transfer Service, Columbus
- Mongolian Restaurants, Columbus
- Monuments, Tombstones, Markers & Memorials, Columbus
- Mortgage Bankers & Correspondents, Columbus
- Mortgage Brokers, Columbus
- Mortgage Companies, Columbus
- Mortgage Feasibility Consultants, Columbus
- Mortgage Loan Processors, Columbus
- Mortgages & Loans, Columbus
- Mosques, Columbus
- Motion Picture & Television Production Services, Columbus
- Motion Picture Dists Exchanges & Representatives, Columbus
- Motion Picture Pre & Post Production Services, Columbus
- Motion Pictures Video Tape Duplication & Transfer Services, Columbus
- Motivational & Self Improvement Schools, Columbus
- Motivational Speakers & Consultants, Columbus - Speakers, Lectures & Seminars
- Motor Homes, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Motorcycle & Motor Scooters Dealers, Repair & Service, Columbus
- Motorcycle Driving School, Columbus
- Motorcycle Parts, Accessories & Dealers, Columbus
- Motorcycle Repair & Service, Columbus
- Motorcycles Paint & Refinishing, Columbus
- Mountain & Rock Climbing Instruction, Columbus
- Movie Advertising, 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
- Multimedia Publishers, Columbus - Multimedia Services & Systems
- Museums, Columbus
- Music, Columbus
- Music Distribution, Columbus
- Music Entertainment, Columbus
- Music Lessons, Columbus
- Music Lessons - Instrumental, Columbus
- Music Lessons - Vocal, Columbus
- Music Schools, Columbus
- Musical Instrument Manufacturers, Columbus
- Musical Instrument Rental, Columbus - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Columbus
- Musical Instruments - Guitars, Columbus
- Musical Instruments - Violins, Columbus
- Musical Instruments Repair, Sales & Service, Columbus
- Musical Recording Services, Columbus
- Musicians, Bands & Disc Jockeys, Columbus
- Muslim Church, Columbus
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