- Major Appliances, Mansfield Center - Household & Kitchen
- Management Consultants & Services, Mansfield Center
- Manicurists & Pedicurists, Mansfield Center
- Manufacturing, Mansfield Center
- Marriage & Family Counselors, Mansfield Center
- Masonry Materials & Supplies, Mansfield Center
- Massage Therapy, Mansfield Center
- Mechanical Engineer, Mansfield Center - Mechanical Engineering Service
- Medical Diagnostic Clinics, Mansfield Center - Clinical Labs & Centers
- Medical Supplies & Equipment, Mansfield Center
- Mental Health Clinics, Mansfield Center - Treatment Centers
- Mental Health Specialists, Mansfield Center - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Mansfield Center
- Merchandising & Marketing Consultants, Mansfield Center
- Methodist Church, Mansfield Center
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- Mexican Restaurants, Mansfield Center
- Microfilm & Imaging Service, Equipment & Supplies , Mansfield Center
- Middle Eastern Restaurants, Mansfield Center
- Mini & Self Storage, Mansfield Center
- Miscellaneous Industry, Mansfield Center
- Miscellaneous Personal Services, Mansfield Center
- Motor Vehicle, Mansfield Center
- Motor Vehicle Rental & Leasing, Mansfield Center
- Motorcycle Parts, Accessories & Dealers, Mansfield Center
- Movie Theaters, Mansfield Center
- Moving Supplies & Equipment Rental, Mansfield Center
- Moving Truck Rental , Mansfield Center
- Muffler Shop & Exhaust Systems, Mansfield Center
- Musical Instruments Repair, Sales & Service, Mansfield Center
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