- Management Consultants & Services, Martinsville
- Manicurists & Pedicurists, Martinsville
- Manufacturing, Martinsville
- Manufacturing Products, Martinsville
- Martial Arts & Self Defense Schools, Martinsville
- Masonry Contractors, Martinsville - Stone Mason, Brick Mason - Install & Repair
- Medical Supplies & Equipment, Martinsville
- Membership Sports & Recreation Clubs, Martinsville
- Mental Health Specialists, Martinsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Martinsville
- Miscellaneous Personal Services, Martinsville
- Miscellaneous Professional, Martinsville
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- Mortgage Bankers & Correspondents, Martinsville
- Mortgage Brokers, Martinsville
- Mortgage Companies, Martinsville
- Mortgage Feasibility Consultants, Martinsville
- Mortgages & Loans, Martinsville
- Motor Vehicle, Martinsville
- Muffler Shop & Exhaust Systems, Martinsville
- Music, Martinsville
- Music Lessons, Martinsville
- Music Lessons - Instrumental, Martinsville
- Musical Instrument Rental, Martinsville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Martinsville
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