- Manicurists & Pedicurists, Marion
- Manufacturing, Marion
- Marble & Terrazzo Flooring - Cleaning & Service, Marion
- Marriage & Family Counselors, Marion
- Masonry Materials & Supplies, Marion
- Mass Transit Vehicle Dealers, Marion
- Mental Health Clinics, Marion - Treatment Centers
- Methodist Church, Marion
- Mexican Restaurants, Marion
- Military Supplies, Marion
- Miscellaneous Business Credit Institutions & Services, Marion
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- Miscellaneous Agriculture, Marion
- Miscellaneous Government, Marion
- Miscellaneous Professional, Marion
- Mortgage Bankers & Correspondents, Marion
- Mortgage Companies, Marion
- Motor Vehicle, Marion
- Motor Vehicle Rental & Leasing, Marion
- Motorcycle & Motor Scooters Dealers, Repair & Service, Marion
- Motorcycle Repair & Service, Marion
- Moving Truck Rental , Marion
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