- Machine Shop, Ironton
- Machinery, Supplies & Equipment - Business Supplies Related, Ironton
- Major Appliances, Ironton - Household & Kitchen
- Manufacturing, Ironton
- Manufacturing Products, Ironton
- Marriage & Family Counselors, Ironton
- Masonry Materials & Supplies, Ironton
- Meat Market, Wholesale & Products, Ironton
- Medical Supplies & Equipment, Ironton
- Methodist Church, Ironton
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- Mexican Restaurants, Ironton
- Miscellaneous Government, Ironton
- Miscellaneous Photographers, Ironton
- Monuments, Tombstones, Markers & Memorials, Ironton
- Mortgage Bankers & Correspondents, Ironton
- Mortgages & Loans, Ironton
- Motor Vehicle, Ironton
- Motor Vehicle Rental & Leasing, Ironton
- Moving Truck Rental , Ironton
- Muffler Shop & Exhaust Systems, Ironton
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