- Machine Shop & Tool Repair Service, Charlestown
- Machine Tools , Charlestown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Charlestown
- Manufacturing, Charlestown
- Manufacturing Products, Charlestown
- Marine Supplies & Equipment, Charlestown - Boat Supplies
- Masonry Contractors, Charlestown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Charlestown
- Medical Equipment Manufacturers, Charlestown
- Mental Health Specialists, Charlestown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Charlestown
- Metal Distributors, Charlestown
- Metal Finishers, Charlestown
- Metal Plating & Polishing, Charlestown
- Metal Repair Service & Blacksmith, Charlestown - Iron Works
- Metal Working Machinery, Charlestown
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- Methodist Church, Charlestown
- Mini Golf Courses, Charlestown
- Mining, Charlestown
- Miscellaneous Agriculture, Charlestown
- Miscellaneous Government, Charlestown
- Mobile Home Parks & Communities , Charlestown
- Modular & Mobile Homes For Sale, Charlestown - Manufactured Homes Sale & Service
- Motor Vehicle, Charlestown
- Motor Vehicle Rental & Leasing, Charlestown
- Moving Supplies & Equipment Rental, Charlestown
- Moving Truck Rental , Charlestown
- Muffler Shop & Exhaust Systems, Charlestown
- Museums, Charlestown
- Music, Charlestown
- Musical Instruments & Equipment Stores, Charlestown
- Musical Instruments Repair, Sales & Service, Charlestown
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