- Machine Shop, Southborough
- Machine Shop & Tool Repair Service, Southborough
- Machinery, Supplies & Equipment - Business Production Related, Southborough
- Machinery, Supplies & Equipment - Business Supplies Related, Southborough
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southborough
- Magazine & Newspaper Stands, Southborough - Dealers & Distributors
- Major Appliances, Southborough - Household & Kitchen
- Management Consultants & Services, Southborough
- Manufacturers Agents & Representatives, Southborough
- Manufacturers Representative, Southborough - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Southborough
- Manufacturing Products, Southborough
- Masonry Materials & Supplies, Southborough
- Massage Therapists & Professional, Southborough
- Massage Therapy, Southborough
- Meat Packers, Southborough
- Mechanical Contractors, Southborough - Install, Service & Repair
- Mechanical Engineer, Southborough - Mechanical Engineering Service
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- Medical Billing Services, Southborough
- Medical Diagnostic Clinics, Southborough - Clinical Labs & Centers
- Medical Supplies & Equipment, Southborough
- Meeting & Event Planning Services, Southborough - Conference Consultants
- Mental Health Specialists, Southborough - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Detecting Equipment, Southborough
- Metal Lockers, Southborough
- Mining, Southborough
- Miscellaneous Household Item Repair, Southborough
- Miscellaneous Industry, Southborough
- Miscellaneous Manufacturing, Southborough
- Miscellaneous Personal Services, Southborough
- Miscellaneous Professional, Southborough
- Monuments, Tombstones, Markers & Memorials, Southborough
- Mortgage Bankers & Correspondents, Southborough
- Motion Picture Pre & Post Production Services, Southborough
- Motor Vehicle, Southborough
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