- Machinery, Supplies & Equipment - Business Production Related, Acton
- Machinery, Supplies & Equipment - Business Supplies Related, Acton
- Major Appliances, Acton - Household & Kitchen
- Management Consultants & Services, Acton
- Manufacturing, Acton
- Martial Arts & Self Defense Schools, Acton
- Mechanical Engineer, Acton - Mechanical Engineering Service
- Mexican Restaurants, Acton
- Miscellaneous Business Services, Acton
- Miscellaneous Government, Acton
- Miscellaneous Personal Services, Acton
- Miscellaneous Professional, Acton
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- Mobile Home Contractors, Acton
- Mobile Home Improvements & Repairs, Acton
- Mobile Home Parks & Communities , Acton
- Mortgage Bankers & Correspondents, Acton
- Motor Vehicle, Acton
- Motor Vehicle Rental & Leasing, Acton
- Movie Theaters, Acton
- Moving Companies, Acton
- Moving Truck Rental , Acton
- Music, Acton
- Musical Recording Services, Acton
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