- Management Consultants & Services, East Wareham
- Manicurists & Pedicurists, East Wareham
- Manufacturing, East Wareham
- Manufacturing Products, East Wareham
- Marketing Consultants Professional Practices, East Wareham
- Martial Arts & Self Defense Schools, East Wareham
- Mental Health Specialists, East Wareham - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, East Wareham
- Military Supplies, East Wareham
- Millwork Contractors, East Wareham
- Mirrors, East Wareham - Custom, Framed, Bathroom, Vanity & Wall Mirrors
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- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, East Wareham
- Mobile Home Parks & Communities , East Wareham
- Modular & Mobile Homes For Sale, East Wareham - Manufactured Homes Sale & Service
- Motor Vehicle, East Wareham
- Motor Vehicle Rental & Leasing, East Wareham
- Moving Truck Rental , East Wareham
- Muffler Shop & Exhaust Systems, East Wareham
- Music, East Wareham
- Music Lessons, East Wareham
- Music Lessons - Instrumental, East Wareham
- Musical Instruments & Equipment Stores, East Wareham
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