- Machine Shop & Tool Repair Service, Acton
- Machine Tools , Acton
- Machinery, Supplies & Equipment - Business Production Related, Acton
- Machinery, Supplies & Equipment - Business Supplies Related, Acton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Acton
- Magazine & Newspaper Stands, Acton - Dealers & Distributors
- Magnetic Devices, Acton
- Magnets & Magnetic Devices, Acton
- Mailbox Rental Services, Acton
- Mailing, Delivery & Courier Service, Acton
- Major Appliances, Acton - Household & Kitchen
- Management Consultants & Services, Acton
- Manicurists & Pedicurists, Acton
- Manufacturers Agents & Representatives, Acton
- Manufacturers Representative, Acton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Acton
- Manufacturing Products, Acton
- Marriage & Family Counselors, Acton
- Martial Arts & Self Defense Schools, Acton
- Masonry Contractors, Acton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Acton
- Massage Therapists & Professional, Acton
- Massage Therapy, Acton
- Massage Therapy Relaxation, Acton
- Mechanical Engineer, Acton - Mechanical Engineering Service
- Medical Equipment Manufacturers, Acton
- Medical Supplies & Equipment, Acton
- Membership Sports & Recreation Clubs, Acton
- Men's Clothing Stores, Acton - Clothes & Accessories
- Mental Health Specialists, Acton - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Acton
- Mexican Restaurants, Acton
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- Microwave Communications, Acton
- Middle Eastern Restaurants, Acton
- Millwork Contractors, Acton
- Mind-Body Massage, Acton
- Mining, Acton
- Mirrors, Acton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Acton
- Miscellaneous Business Services, Acton
- Miscellaneous Government, Acton
- Miscellaneous Manufacturing, Acton
- Miscellaneous Personal Services, Acton
- Miscellaneous Photographers, Acton
- Miscellaneous Professional, Acton
- Monuments Cleaning, Acton
- Monuments, Tombstones, Markers & Memorials, Acton
- Mortgage Bankers & Correspondents, Acton
- Motion Picture Pre & Post Production Services, Acton
- Motor Vehicle, Acton
- Motor Vehicle Rental & Leasing, Acton
- Moving & Storage Supplies & Equipment, Acton
- Moving Companies, Acton
- Moving Supplies & Equipment Rental, Acton
- Moving Truck Rental , Acton
- Muffler Shop & Exhaust Systems, Acton
- Museums, Acton
- Music, Acton
- Music Lessons, Acton
- Music Lessons - Instrumental, Acton
- Musical Instrument Manufacturers, Acton
- Musical Instruments & Equipment Stores, Acton
- Musical Recording Services, Acton
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