- Machine Shop & Tool Repair Service, Mcconnelsville
- Machinery, Supplies & Equipment - Business Supplies Related, Mcconnelsville
- Manicurists & Pedicurists, Mcconnelsville
- Manufacturing, Mcconnelsville
- Manufacturing Services, Mcconnelsville
- Marriage & Family Counselors, Mcconnelsville
- Massage Therapy, Mcconnelsville
- Metal Buildings, Mcconnelsville - Kits, Homes, Steel Buildings, etc
- Methodist Church, Mcconnelsville
- Mexican Restaurants, Mcconnelsville
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- Miscellaneous Government, Mcconnelsville
- Miscellaneous Manufacturing, Mcconnelsville
- Mobile Home Contractors, Mcconnelsville
- Mobile Home Improvements & Repairs, Mcconnelsville
- Monuments, Tombstones, Markers & Memorials, Mcconnelsville
- Mortgage Bankers & Correspondents, Mcconnelsville
- Motor Vehicle, Mcconnelsville
- Motor Vehicle Rental & Leasing, Mcconnelsville
- Movie Theaters, Mcconnelsville
- Moving Truck Rental , Mcconnelsville
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