- Machine Shop, Keyser
- Machinery, Supplies & Equipment - Business Supplies Related, Keyser
- Machinery, Supplies & Equipment - Construction & Contractor Related, Keyser
- Management Consultants & Services, Keyser
- Manicurists & Pedicurists, Keyser
- Manufacturing, Keyser
- Marriage & Family Counselors, Keyser
- Masonry Contractors, Keyser - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Keyser
- Mausoleums Developers, Keyser
- Meat Market, Wholesale & Products, Keyser
- Medical Supplies & Equipment, Keyser
- Mental & Developmental Information & Referral Services, Keyser
- Mental Health Clinics, Keyser - Treatment Centers
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- Mental Health Specialists, Keyser - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Keyser
- Metal Repair Service & Blacksmith, Keyser - Iron Works
- Methodist Church, Keyser
- Miscellaneous Government, Keyser
- Miscellaneous Personal Services, Keyser
- Mortgage Bankers & Correspondents, Keyser
- Mortgages & Loans, Keyser
- Motor Vehicle, Keyser
- Motor Vehicle Rental & Leasing, Keyser
- Moving Truck Rental , Keyser
- Music, Keyser
- Musical Instruments & Equipment Stores, Keyser
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