- Machinery, Supplies & Equipment - Business Supplies Related, Parkersburg
- Major Appliances, Parkersburg - Household & Kitchen
- Management Consultants & Services, Parkersburg
- Manicurists & Pedicurists, Parkersburg
- Manufacturing, Parkersburg
- Manufacturing Products, Parkersburg
- Marriage & Family Counselors, Parkersburg
- Martial Arts & Self Defense Schools, Parkersburg
- Masonry Contractors, Parkersburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Parkersburg
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- Meat Market, Wholesale & Products, Parkersburg
- Medical Supplies & Equipment, Parkersburg
- Membership Sports & Recreation Clubs, Parkersburg
- Methodist Church, Parkersburg
- Miscellaneous Government, Parkersburg
- Miscellaneous Professional, Parkersburg
- Monuments, Tombstones, Markers & Memorials, Parkersburg
- Motor Vehicle, Parkersburg
- Muffler Shop & Exhaust Systems, Parkersburg
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