- Machinery, Supplies & Equipment - Business Production Related, Hopkinton
- Machinery, Supplies & Equipment - Business Supplies Related, Hopkinton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hopkinton
- Major Appliances, Hopkinton - Household & Kitchen
- Management Consultants & Services, Hopkinton
- Manicurists & Pedicurists, Hopkinton
- Manifold Business Forms Manufacturers, Hopkinton
- Manufacturers Agents & Representatives, Hopkinton
- Manufacturers Representative, Hopkinton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Hopkinton
- Manufacturing Products, Hopkinton
- Marketing Schools, Hopkinton
- Marriage & Family Counselors, Hopkinton
- Masonry Contractors, Hopkinton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Hopkinton
- Massage Therapists & Professional, Hopkinton
- Massage Therapy, Hopkinton
- Material Handling Equipment, Hopkinton - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Diagnostic Clinics, Hopkinton - Clinical Labs & Centers
- Medical Research, Hopkinton
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- Medical Research & Development, Hopkinton - Medical Information & Research
- Medical Supplies & Equipment, Hopkinton
- Membership Sports & Recreation Clubs, Hopkinton
- Mental & Developmental Information & Referral Services, Hopkinton
- Mental Health Specialists, Hopkinton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Hopkinton - Iron Works
- Mining, Hopkinton
- Miscellaneous Household Item Repair, Hopkinton
- Miscellaneous Business Services, Hopkinton
- Miscellaneous Industry, Hopkinton
- Miscellaneous Manufacturing, Hopkinton
- Miscellaneous Professional, Hopkinton
- Mortgage Bankers & Correspondents, Hopkinton
- Motion Picture Pre & Post Production Services, Hopkinton
- Motor Vehicle, Hopkinton
- Motor Vehicle Rental & Leasing, Hopkinton
- Moving & Storage Supplies & Equipment, Hopkinton
- Moving Supplies & Equipment Rental, Hopkinton
- Moving Truck Rental , Hopkinton
- Musical Instruments Repair, Sales & Service, Hopkinton
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