- Machine Shop, Hallowell
- Machinery, Supplies & Equipment - Business Supplies Related, Hallowell
- Management Consultants & Services, Hallowell
- Manufacturing, Hallowell
- Market Research & Analysis , Hallowell - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Hallowell
- Masonry Materials & Supplies, Hallowell
- Massage Therapists & Professional, Hallowell
- Massage Therapy, Hallowell
- Mental Health Specialists, Hallowell - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Buyers, Hallowell
- Methodist Church, Hallowell
- Mining, Hallowell
- Mining Services, Hallowell
- Miscellaneous Business Services, Hallowell
- Miscellaneous Government, Hallowell
- Miscellaneous Professional, Hallowell
- Monuments, Tombstones, Markers & Memorials, Hallowell
- Motor Vehicle, Hallowell
- Musical Instruments Repair, Sales & Service, Hallowell
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