- Machinery, Supplies & Equipment - Business Production Related, Charlestown
- Machinery, Supplies & Equipment - Business Supplies Related, Charlestown
- Magazine & Newspaper Stands, Charlestown - Dealers & Distributors
- Management Consultants & Services, Charlestown
- Manicurists & Pedicurists, Charlestown
- Manifold Business Forms Manufacturers, Charlestown
- Manufacturers Agents & Representatives, Charlestown
- Manufacturers Representative, Charlestown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Charlestown
- Manufacturing Products, Charlestown
- Marinas & Marina Services, Charlestown
- Marine Contractors & Designers, Charlestown
- Marine Pilot & Operator Service, Charlestown
- Marine Products And Services, Charlestown
- Marine Repair & Service Stations, Charlestown
- Marine Supplies & Equipment Repair, Charlestown - Boat Supplies & Equipment
- Market Research & Analysis , Charlestown - Market Analysis, Business & Economic Research
- Marketing Schools, Charlestown
- Marriage & Family Counselors, Charlestown
- Marriage & Family Counselors Information & Referrals, Charlestown
- Masonry Materials & Supplies, Charlestown
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- Massage Therapists & Professional, Charlestown
- Massage Therapy, Charlestown
- Medical Groups & Clinics, Charlestown - Medical & Health Centers
- Membership Sports & Recreation Clubs, Charlestown
- Miscellaneous Household Item Repair, Charlestown
- Miscellaneous Business Services, Charlestown
- Miscellaneous Government, Charlestown
- Miscellaneous Manufacturing, Charlestown
- Miscellaneous Personal Services, Charlestown
- Miscellaneous Professional, Charlestown
- Mortgage Bankers & Correspondents, Charlestown
- Motion Picture & Television Production Services, Charlestown
- Motion Picture Dists & Producers, Charlestown
- Motion Picture Pre & Post Production Services, Charlestown
- Motor Vehicle, Charlestown
- Moving Companies, Charlestown
- Museums, Charlestown
- Music, Charlestown
- Musical Instrument Rental, Charlestown - Band & Orchestra Instruments
- Musical Recording Services, Charlestown
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