- Machine Shop & Tool Repair Service, Cambridge
- Mailing, Delivery & Courier Service, Cambridge
- Manufacturing, Cambridge
- Manufacturing Products, Cambridge
- Marking, Stamping & Engraving Equipment, Cambridge
- Marriage & Family Counselors, Cambridge
- Meat Market, Wholesale & Products, Cambridge
- Mental Health Specialists, Cambridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Cambridge
- Miscellaneous Government, Cambridge
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