- Machine Shop & Tool Repair Service, Healdton
- Machinery, Supplies & Equipment - Business Production Related, Healdton
- Machinery, Supplies & Equipment - Business Supplies Related, Healdton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Healdton
- Manufacturing, Healdton
- Medical Groups & Clinics, Healdton - Medical & Health Centers
- Medical Supplies & Equipment, Healdton
- Methodist Church, Healdton
- Michelin Tires, Healdton - Dealers
- Mining, Healdton
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- Miscellaneous Business Services, Healdton
- Miscellaneous Government, Healdton
- Monuments, Tombstones, Markers & Memorials, Healdton
- Mortgage Bankers & Correspondents, Healdton
- Mortgage Contracts & Services, Healdton
- Motor Vehicle, Healdton
- Motor Vehicle Rental & Leasing, Healdton
- Movie Theaters, Healdton
- Moving Truck Rental , Healdton
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