- Machine Shop & Tool Repair Service, West Wareham
- Machinery, Supplies & Equipment - Business Supplies Related, West Wareham
- Management Consultants & Services, West Wareham
- Manufacturing, West Wareham
- Manufacturing Products, West Wareham
- Marinas & Marina Services, West Wareham
- Masonry Contractors, West Wareham - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, West Wareham
- Massage Therapy, West Wareham
- Mechanical Contractors, West Wareham - Install, Service & Repair
- Mechanical Engineer, West Wareham - Mechanical Engineering Service
- Medical Billing Services, West Wareham
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- Medical Research, West Wareham
- Medical Research & Development, West Wareham - Medical Information & Research
- Methodist Church, West Wareham
- Miscellaneous Manufacturing, West Wareham
- Mobile Home Parks & Communities , West Wareham
- Monuments, Tombstones, Markers & Memorials, West Wareham
- Motor Vehicle, West Wareham
- Motor Vehicle Rental & Leasing, West Wareham
- Movie Theaters, West Wareham
- Moving & Storage Supplies & Equipment, West Wareham
- Moving Companies, West Wareham
- Moving Truck Rental , West Wareham
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