- Machine Shop & Tool Repair Service, Mc Connellsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Mc Connellsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mc Connellsburg
- Major Appliances, Mc Connellsburg - Household & Kitchen
- Management Consultants & Services, Mc Connellsburg
- Manufacturing, Mc Connellsburg
- Manufacturing Products, Mc Connellsburg
- Membership Sports & Recreation Clubs, Mc Connellsburg
- Mental Health Specialists, Mc Connellsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Mc Connellsburg
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- Miscellaneous Household Item Repair, Mc Connellsburg
- Miscellaneous Government, Mc Connellsburg
- Miscellaneous Personal Services, Mc Connellsburg
- Miscellaneous Professional, Mc Connellsburg
- Monuments, Tombstones, Markers & Memorials, Mc Connellsburg
- Mortgage Bankers & Correspondents, Mc Connellsburg
- Motor Vehicle, Mc Connellsburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Mc Connellsburg
- Motorcycle Repair & Service, Mc Connellsburg
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