- Machine Shop, Martinsburg
- Machine Shop & Tool Repair Service, Martinsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Martinsburg
- Mail Delivery Service, Martinsburg
- Major Appliances, Martinsburg - Household & Kitchen
- Manufacturing, Martinsburg
- Martial Arts & Self Defense Schools, Martinsburg
- Massage Therapy, Martinsburg
- Medical Supplies & Equipment, Martinsburg
- Membership Sports & Recreation Clubs, Martinsburg
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