- Machine Shop & Tool Repair Service, Belchertown
- Machine Tool Repair & Rebuild, Belchertown
- Machinery, Supplies & Equipment - Business Production Related, Belchertown
- Maintenance, Cleaning & Sanitation, Belchertown
- Management Consultants & Services, Belchertown
- Manicurists & Pedicurists, Belchertown
- Manufacturing, Belchertown
- Marriage & Family Counselors, Belchertown
- Martial Arts & Self Defense Schools, Belchertown
- Masonry Contractors, Belchertown - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Belchertown
- Massage Therapy, Belchertown
- Membership Sports & Recreation Clubs, Belchertown
- Mental Health Specialists, Belchertown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Belchertown
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- Methodist Church, Belchertown
- Mildew Removal & Control, Belchertown - Mold Removal
- Mini & Self Storage, Belchertown
- Mini Golf Courses, Belchertown
- Miscellaneous Government, Belchertown
- Miscellaneous Industry, Belchertown
- Miscellaneous Personal Services, Belchertown
- Miscellaneous Professional, Belchertown
- Mobile Home Parks & Communities , Belchertown
- Motor Vehicle, Belchertown
- Motor Vehicle Rental & Leasing, Belchertown
- Motorcycle Parts, Accessories & Dealers, Belchertown
- Moving Truck Rental , Belchertown
- Muffler Shop & Exhaust Systems, Belchertown
- Museums, Belchertown
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