- Major Appliances, Bar Harbor - Household & Kitchen
- Management Consultants & Services, Bar Harbor
- Manufacturing, Bar Harbor
- Marine Contractors & Designers, Bar Harbor
- Masonry Contractors, Bar Harbor - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Bar Harbor
- Mental Health Specialists, Bar Harbor - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini Golf Courses, Bar Harbor
- Miscellaneous Household Item Repair, Bar Harbor
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