- Machine Shop & Tool Repair Service, Columbus
- Machine Tools , Columbus
- Machinery And Equipment Manufacturers, Columbus
- Machinery Custom Design Manufacturers, Columbus
- Machinery, Supplies & Equipment - Business Production Related, Columbus
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus
- Magicians & Hypnotist Entertainers, Columbus
- Mailbox Rental Services, Columbus
- Mailing, Delivery & Courier Service, Columbus
- Maintenance, Cleaning & Sanitation, Columbus
- Major Appliances, Columbus - Household & Kitchen
- Make Up & Cosmetics Application, Columbus
- Malls & Shopping Centers, Columbus
- Management Consultants & Services, Columbus
- Manicurists & Pedicurists, Columbus
- Manufacturers Agents & Representatives, Columbus
- Manufacturers Representative, Columbus - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Maps Mounting, Columbus
- Market Research & Analysis , Columbus - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Columbus
- Marriage & Family Counselors, Columbus
- Martial Arts & Self Defense Schools, Columbus
- Masonry Materials & Supplies, Columbus
- Massage Therapists & Professional, Columbus
- Massage Therapy, Columbus
- Mastectomy Apparel, Forms, Prostheses & Supplies, Columbus
- Material Handling & Heavy Machinery & Equipment, Columbus
- Material Handling Equipment, Columbus - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Columbus
- Mechanical Contractors, Columbus - Install, Service & Repair
- Mechanical Research & Development, Columbus
- Medical & Dental Management, Columbus
- Medical Business Management Services, Columbus
- Medical Equipment Manufacturers, Columbus
- Medical Groups & Clinics, Columbus - Medical & Health Centers
- Medical Management & Business Administration Service, Columbus
- Medical Supplies & Equipment, Columbus
- Membership Sports & Recreation Clubs, Columbus
- Men's Clothing Stores, Columbus - Clothes & Accessories
- Mental Health Clinics, Columbus - Treatment Centers
- Mental Health Specialists, Columbus - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Columbus
- Merchandising & Marketing Consultants, Columbus
- Merle Norman Cosmetics, Columbus
- Metal Buildings, Columbus - Kits, Homes, Steel Buildings, etc
- Metal Heat Treating, Columbus
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- Metal Repair Service & Blacksmith, Columbus - Iron Works
- Metal Roll Forming Manufacturers, Columbus
- Metal Stampings Manufacturers, Columbus
- Metaphysical Churches, Columbus
- Methodist Church, Columbus
- Mexican Restaurants, Columbus
- Mildew Removal & Control, Columbus - Mold Removal
- Mini & Self Storage, Columbus
- Mini Golf Courses, Columbus
- Mining, Columbus
- Ministries Church, Columbus
- Mirrors, Columbus - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Columbus
- Miscellaneous Household Item Repair, Columbus
- Miscellaneous Agriculture, Columbus
- Miscellaneous Business Services, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Industry, 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
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Moldings Materials, Columbus
- Molds, Columbus
- Monuments, Tombstones, Markers & Memorials, Columbus
- Mortgage Bankers & Correspondents, Columbus
- Motion Picture & Television Production Services, Columbus
- Motor Sports, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Motorcycle Parts, Accessories & Dealers, Columbus
- Movie Theaters, Columbus
- Moving & Storage Supplies & Equipment, Columbus
- Moving Companies, Columbus
- Moving Truck Rental , Columbus
- Muffler Shop & Exhaust Systems, Columbus
- Museums, Columbus
- Music, Columbus
- Music Entertainment, Columbus
- Music Lessons, Columbus
- Music Lessons - Instrumental, Columbus
- Musical Instrument Rental, Columbus - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Columbus
- Musical Instruments Repair, Sales & Service, Columbus
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