- Machine Shop & Tool Repair Service, Acton
- Machinery, Supplies & Equipment - Business Supplies Related, Acton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Acton
- Magazine & Newspaper Stands, Acton - Dealers & Distributors
- Major Appliances, Acton - Household & Kitchen
- Management Consultants & Services, Acton
- Manicurists & Pedicurists, Acton
- Manufacturing, Acton
- Manufacturing Products, Acton
- Marriage & Family Counselors, Acton
- Masonry Materials & Supplies, Acton
- Massage Therapists & Professional, Acton
- Massage Therapy, Acton
- Membership Sports & Recreation Clubs, Acton
- Mens & Womens Clothing, Acton
- Mental Health Specialists, Acton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Acton
- Metal Coating & Allied Services, Acton
- Metal Plating & Polishing, Acton
- Mexican Restaurants, Acton
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- Miscellaneous Agriculture, Acton
- Miscellaneous Business Services, Acton
- Miscellaneous Government, Acton
- Miscellaneous Industry, Acton
- Miscellaneous Manufacturing, Acton
- Miscellaneous Personal Services, Acton
- Miscellaneous Professional, Acton
- Money Transfer Service, Acton
- Monuments, Tombstones, Markers & Memorials, Acton
- Motor Vehicle, Acton
- Motor Vehicle Rental & Leasing, Acton
- Moving Truck Rental , Acton
- Muffler Shop & Exhaust Systems, Acton
- Murals & Faux Finish Walls, Acton
- Music, Acton
- Music Entertainment, Acton
- Music Lessons, Acton
- Music Lessons - Instrumental, Acton
- Music Schools, Acton
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