- Machine Shop & Tool Repair Service, Wellsburg
- Machinery, Supplies & Equipment - Business Production Related, Wellsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Wellsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wellsburg
- Magazine & Newspaper Stands, Wellsburg - Dealers & Distributors
- Magistrate Courts, Wellsburg
- Management Consultants & Services, Wellsburg
- Manicurists & Pedicurists, Wellsburg
- Manifold Business Forms Manufacturers, Wellsburg
- Manufacturing, Wellsburg
- Medical & Dental Management, Wellsburg
- Medical Supplies & Equipment, Wellsburg
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- Methodist Church, Wellsburg
- Mini & Self Storage, Wellsburg
- Miscellaneous Business Product Repair, Wellsburg
- Miscellaneous Government, Wellsburg
- Miscellaneous Personal Services, Wellsburg
- Miscellaneous Photographers, Wellsburg
- Mortgage Companies, Wellsburg
- Motor Vehicle, Wellsburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Wellsburg
- Motorcycle Repair & Service, Wellsburg
- Museums, Wellsburg
- Musical Instruments Repair, Sales & Service, Wellsburg
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