- Machine Shop & Tool Repair Service, Sharpsburg
- Machinery, Supplies & Equipment - Business Production Related, Sharpsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Sharpsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sharpsburg
- Management Consultants & Services, Sharpsburg
- Manufacturing, Sharpsburg
- Membership Sports & Recreation Clubs, Sharpsburg
- Methodist Church, Sharpsburg
- Mexican Restaurants, Sharpsburg
- Mini & Self Storage, Sharpsburg
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- Ministries Church, Sharpsburg
- Miscellaneous Government, Sharpsburg
- Miscellaneous Personal Services, Sharpsburg
- Miscellaneous Photographers, Sharpsburg
- Miscellaneous Professional, Sharpsburg
- Monuments, Tombstones, Markers & Memorials, Sharpsburg
- Motor Vehicle, Sharpsburg
- Movie Theaters, Sharpsburg
- Mulch, Peat & Moss Products, Sharpsburg
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