- Machine Shop & Tool Repair Service, Columbus
- Mailing, Delivery & Courier Service, Columbus
- Manicurists & Pedicurists, Columbus
- Manufacturing, Columbus
- Manufacturing Products, Columbus
- Marriage & Family Counselors, Columbus
- Masonry Materials & Supplies, Columbus
- Massage Therapists & Professional, Columbus
- Massage Therapy, Columbus
- Medical Diagnostic Clinics, Columbus - Clinical Labs & Centers
- Mennonite Church, Columbus
- Mental Health Specialists, Columbus - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Working Machinery, Columbus
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- Methodist Church, Columbus
- Mexican Restaurants, Columbus
- Mini & Self Storage, Columbus
- Miscellaneous Government, Columbus
- Miscellaneous Manufacturing, Columbus
- Miscellaneous Photographers, Columbus
- Motor Vehicle, Columbus
- Motor Vehicle Rental & Leasing, Columbus
- Moving Supplies & Equipment Rental, Columbus
- Moving Truck Rental , Columbus
- Mulch, Peat & Moss Products, Columbus
- Museums, Columbus
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