- Machine Shop, Donora
- Machine Shop & Tool Repair Service, Donora
- Machinery, Supplies & Equipment - Business Production Related, Donora
- Machinery, Supplies & Equipment - Business Supplies Related, Donora
- Machinery, Supplies & Equipment - Construction & Contractor Related, Donora
- Manufacturing, Donora
- Manufacturing Products, Donora
- Marine Contractors & Designers, Donora
- Mental Health Specialists, Donora - Psychologist, Psychiatrist, Psychotherapist, etc
- Microfilm & Imaging Service, Equipment & Supplies , Donora
- Mining, Donora
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- Mining Contractors, Donora - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Donora
- Mining, Crude-Oil Production, Donora - Mining Companies
- Ministries Church, Donora
- Miscellaneous Photographers, Donora
- Miscellaneous Professional, Donora
- Monuments, Tombstones, Markers & Memorials, Donora
- Motor Vehicle, Donora
- Museums, Donora
- Music, Donora
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