- Machine Shop & Tool Repair Service, Sturbridge
- Machinery, Supplies & Equipment - Business Supplies Related, Sturbridge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sturbridge
- Magazine & Newspaper Stands, Sturbridge - Dealers & Distributors
- Major Appliances, Sturbridge - Household & Kitchen
- Manicurists & Pedicurists, Sturbridge
- Manufacturing, Sturbridge
- Manufacturing Products, Sturbridge
- Marriage & Family Counselors, Sturbridge
- Masonry Materials & Supplies, Sturbridge
- Massage Therapists & Professional, Sturbridge
- Massage Therapy, Sturbridge
- Material Handling Equipment, Sturbridge - Conveyor Belt, Pallet Jack, Forklift, etc
- Meeting & Event Planning Services, Sturbridge - Conference Consultants
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- Mental Health Specialists, Sturbridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Business Product Repair, Sturbridge
- Miscellaneous Government, Sturbridge
- Miscellaneous Manufacturing, Sturbridge
- Miscellaneous Personal Services, Sturbridge
- Miscellaneous Professional, Sturbridge
- Mobile Home Parks & Communities , Sturbridge
- Mortgage Bankers & Correspondents, Sturbridge
- Mortgages Commercial & Industrial, Sturbridge
- Motor Vehicle, Sturbridge
- Motor Vehicle Rental & Leasing, Sturbridge
- Movie Theaters, Sturbridge
- Moving Truck Rental , Sturbridge
- Museums, Sturbridge
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