- Machine Shop, Martinsville
- Machine Shop & Tool Repair Service, Martinsville
- Machine Tools , Martinsville
- Machine Tools Manufacturers Metal Cutting Types, Martinsville
- Machinery And Equipment Manufacturers, Martinsville
- Machinery, Supplies & Equipment - Business Production Related, Martinsville
- Machinery, Supplies & Equipment - Business Supplies Related, Martinsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Martinsville
- Maintenance, Cleaning & Sanitation, Martinsville
- Major Appliances, Martinsville - Household & Kitchen
- Management Consultants & Services, Martinsville
- Manicurists & Pedicurists, Martinsville
- Manufacturers Agents & Representatives, Martinsville
- Manufacturers Representative, Martinsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Martinsville
- Manufacturing Products, Martinsville
- Marriage & Family Counselors, Martinsville
- Martial Arts & Self Defense Schools, Martinsville
- Masonry Materials & Supplies, Martinsville
- Massage Therapists & Professional, Martinsville
- Massage Therapy, Martinsville
- Meat Market, Wholesale & Products, Martinsville
- Medical & Health Service Organizations, Martinsville
- Medical Billing Services, Martinsville
- Medical Supplies & Equipment, Martinsville
- Membership Sports & Recreation Clubs, Martinsville
- Mental Health Clinics, Martinsville - Treatment Centers
- Mental Health Specialists, Martinsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Martinsville
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- Metal Repair Service & Blacksmith, Martinsville - Iron Works
- Metal Services, Martinsville
- Methodist Church, Martinsville
- Mexican Restaurants, Martinsville
- Mildew Removal & Control, Martinsville - Mold Removal
- Mini & Self Storage, Martinsville
- Ministries Church, Martinsville
- Miscellaneous Government, Martinsville
- Miscellaneous Industry, Martinsville
- Miscellaneous Manufacturing, Martinsville
- Miscellaneous Personal Services, Martinsville
- Miscellaneous Professional, Martinsville
- Mobile Home Parks & Communities , Martinsville
- Molds, Martinsville
- Monuments, Tombstones, Markers & Memorials, Martinsville
- Motor Vehicle, Martinsville
- Motor Vehicle Rental & Leasing, Martinsville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Martinsville
- Motorcycle Parts, Accessories & Dealers, Martinsville
- Motorcycle Repair & Service, Martinsville
- Motorcycle Wreckers, Martinsville
- Movie Theaters, Martinsville
- Moving Supplies & Equipment Rental, Martinsville
- Moving Truck Rental , Martinsville
- Muffler Shop & Exhaust Systems, Martinsville
- Music, Martinsville
- Musical Instrument Manufacturers, Martinsville
- Musical Instruments & Equipment Stores, Martinsville
- Musical Instruments - Guitars, Martinsville
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