- Machine Shop & Tool Repair Service, Boxborough
- Machinery, Supplies & Equipment - Business Supplies Related, Boxborough
- Management Consultants & Services, Boxborough
- Manufacturing, Boxborough
- Market Research & Analysis , Boxborough - Market Analysis, Business & Economic Research
- Marriage & Family Counselors Information & Referrals, Boxborough
- Masonry Contractors, Boxborough - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, Boxborough
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- Mental Health Specialists, Boxborough - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Boxborough
- Millwork Contractors, Boxborough
- Miscellaneous Household Item Repair, Boxborough
- Miscellaneous Business Services, Boxborough
- Moldings Materials, Boxborough
- Motor Vehicle, Boxborough
- Moving Companies, Boxborough
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