- Machine Shop, Columbus
- Machine Shop & Tool Repair Service, Columbus
- Machine Shops Slings, Columbus
- Machinery, Supplies & Equipment - Business Production Related, Columbus
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus
- Mailbox Rental Services, Columbus
- Mailing, Delivery & Courier Service, Columbus
- Major Appliances, Columbus - Household & Kitchen
- Malls & Shopping Centers, Columbus
- Management Consultants & Services, Columbus
- Manicurists & Pedicurists, Columbus
- Manufactured & Mobile Home Movers & Transporting, Columbus
- Manufacturers Agents & Representatives, Columbus
- Manufacturers Representative, Columbus - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Marinas & Marina Services, Columbus
- Marine Products And Services, Columbus
- Marine Repair & Service Stations, Columbus
- Marine Supplies & Equipment Repair, Columbus - Boat Supplies & Equipment
- Marriage & Family Counselors, Columbus
- Martial Arts & Self Defense Schools, Columbus
- Masonry Materials & Supplies, Columbus
- Massage Therapy, Columbus
- Material Handling & Heavy Machinery & Equipment, Columbus
- Material Handling Equipment, Columbus - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, Columbus
- Maytag Appliances, Columbus
- Meat Market, Wholesale & Products, Columbus
- Mechanical Contractors, Columbus - Install, Service & Repair
- Medical Diagnostic Clinics, Columbus - Clinical Labs & Centers
- Medical Supplies & Equipment, Columbus
- Membership Sports & Recreation Clubs, Columbus
- Men's Clothing Stores, Columbus - Clothes & Accessories
- Mental Health Specialists, Columbus - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Columbus - Wood Buildings
- Metal Buildings, Columbus - Kits, Homes, Steel Buildings, etc
- Metal Distributors, Columbus
- Metal Repair Service & Blacksmith, Columbus - Iron Works
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- Methodist Church, Columbus
- Mexican Restaurants, Columbus
- Middle Eastern Restaurants, Columbus
- Millwork Contractors, Columbus
- Mini & Self Storage, Columbus
- Mining, Columbus
- Mining Contractors, Columbus - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Columbus - Mining Companies
- Ministries Church, 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 Personal Services, Columbus
- Miscellaneous Photographers, Columbus
- Miscellaneous Professional, Columbus
- Mission Churches, Columbus
- Mobile Home Insurance, Columbus
- Mobile Home Parks & Communities , Columbus
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Columbus
- Mortgage Bankers & Correspondents, 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
- Movie Theaters, Columbus
- Moving & Storage Supplies & Equipment, Columbus
- Moving Companies, Columbus
- Moving Supplies & Equipment Rental, Columbus
- Moving Truck Rental , Columbus
- Muffler Shop & Exhaust Systems, Columbus
- Music, Columbus
- Musical Instruments & Equipment Stores, Columbus
- Musical Instruments Repair, Sales & Service, Columbus
- Myofunctional Therapy, Columbus
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