- Machine Shop & Tool Repair Service, Columbus
- Machinery, Supplies & Equipment - Business Production Related, Columbus
- Machinery, Supplies & Equipment - Business Supplies Related, Columbus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Columbus
- Major Appliances, Columbus - Household & Kitchen
- Management Consultants & Services, Columbus
- Manicurists & Pedicurists, Columbus
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Marriage & Family Counselors, Columbus
- Masonry Contractors, Columbus - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Columbus
- Massage Therapists & Professional, Columbus
- Massage Therapy, Columbus
- Medical Supplies & Equipment, Columbus
- Meeting & Event Planning Services, Columbus - Conference Consultants
- Membership Sports & Recreation Clubs, Columbus
- Men's & Boys Clothing & Accessories Stores, Columbus
- Mens & Boys Jeans & Western Wear Stores, Columbus
- Mental Health Clinics, Columbus - Treatment Centers
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- Metal Buildings, Columbus - Kits, Homes, Steel Buildings, etc
- Methodist Church, Columbus
- Mexican Restaurants, Columbus
- Mini & Self Storage, Columbus
- Mining, Columbus
- Mirrors, Columbus - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Personal Services, Columbus
- Miscellaneous Photographers, Columbus
- Miscellaneous Professional, Columbus
- Mobile Home Parks & Communities , Columbus
- Modular & Mobile Homes For Sale, Columbus - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Columbus
- Mortgage Companies, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Motorcycle Parts, Accessories & Dealers, Columbus
- Moving Truck Rental , Columbus
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