- Machinery, Supplies & Equipment - Business Production Related, South Dartmouth
- Management Consultants & Services, South Dartmouth
- Manicurists & Pedicurists, South Dartmouth
- Manufacturing, South Dartmouth
- Manufacturing Products, South Dartmouth
- Marinas & Marina Services, South Dartmouth
- Masonry Contractors, South Dartmouth - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Dartmouth
- Massage Therapists & Professional, South Dartmouth
- Massage Therapy, South Dartmouth
- Medical Diagnostic Clinics, South Dartmouth - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, South Dartmouth
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- Miniatures Collectors, South Dartmouth
- Miscellaneous Business Product Repair, South Dartmouth
- Miscellaneous Personal Services, South Dartmouth
- Miscellaneous Photographers, South Dartmouth
- Miscellaneous Professional, South Dartmouth
- Motion Picture & Television Production Services, South Dartmouth
- Motor Vehicle, South Dartmouth
- Motor Vehicle Rental & Leasing, South Dartmouth
- Moving Truck Rental , South Dartmouth
- Muffler Shop & Exhaust Systems, South Dartmouth
- Mulch, Peat & Moss Products, South Dartmouth
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