- Management Consultants & Services, Groton
- Manicurists & Pedicurists, Groton
- Manufacturing, Groton
- Marriage & Family Counselors, Groton
- Masonry Contractors, Groton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Groton
- Massage Therapists & Professional, Groton
- Massage Therapy, Groton
- Medical Billing Services, Groton
- Meeting & Event Planning Services, Groton - Conference Consultants
- Mental Health Specialists, Groton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Groton
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- Mexican Restaurants, Groton
- Mirrors, Groton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Groton
- Miscellaneous Business Services, Groton
- Miscellaneous Government, Groton
- Miscellaneous Personal Services, Groton
- Miscellaneous Professional, Groton
- Mortgage Bankers & Correspondents, Groton
- Motor Vehicle, Groton
- Music, Groton
- Musical Instruments & Equipment Stores, Groton
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