- Machine Tools , Moundsville
- Machinery And Equipment Manufacturers, Moundsville
- Machinery Custom Design Manufacturers, Moundsville
- Machinery, Supplies & Equipment - Business Production Related, Moundsville
- Machinery, Supplies & Equipment - Business Supplies Related, Moundsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Moundsville
- Mailing, Delivery & Courier Service, Moundsville
- Major Appliances, Moundsville - Household & Kitchen
- Management Consultants & Services, Moundsville
- Manicurists & Pedicurists, Moundsville
- Manufacturing, Moundsville
- Manufacturing Equipment & Supplies, Moundsville
- Manufacturing Products, Moundsville
- Masonry Materials & Supplies, Moundsville
- Massage Equipment & Supplies, Moundsville
- Massage Therapists & Professional, Moundsville
- Massage Therapy, Moundsville
- Medical Supplies & Equipment, Moundsville
- Men's Clothing Stores, Moundsville - Clothes & Accessories
- Mental Health Clinics, Moundsville - Treatment Centers
- Mental Health Specialists, Moundsville - Psychologist, Psychiatrist, Psychotherapist, etc
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- Methodist Church, Moundsville
- Mexican Restaurants, Moundsville
- Mining, Moundsville
- Miscellaneous Household Item Repair, Moundsville
- Miscellaneous Agriculture, Moundsville
- Miscellaneous Business Services, Moundsville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Moundsville
- Miscellaneous Government, Moundsville
- Miscellaneous Personal Services, Moundsville
- Miscellaneous Photographers, Moundsville
- Miscellaneous Professional, Moundsville
- Mobile Home Contractors, Moundsville
- Mobile Home Improvements & Repairs, Moundsville
- Monuments, Tombstones, Markers & Memorials, Moundsville
- Mortgages & Loans, Moundsville
- Motor Vehicle, Moundsville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Moundsville
- Motorcycle Repair & Service, Moundsville
- Muffler Shop & Exhaust Systems, Moundsville
- Museums, Moundsville
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