- Machine Shop & Tool Repair Service, Cambridge
- Machinery, Supplies & Equipment - Business Production Related, Cambridge
- Machinery, Supplies & Equipment - Business Supplies Related, Cambridge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cambridge
- Major Appliances, Cambridge - Household & Kitchen
- Management Consultants & Services, Cambridge
- Manicurists & Pedicurists, Cambridge
- Manufacturing, Cambridge
- Manufacturing Products, Cambridge
- Marriage & Family Counselors, Cambridge
- Masonry Materials & Supplies, Cambridge
- Massage Therapists & Professional, Cambridge
- Massage Therapy, Cambridge
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- Membership Sports & Recreation Clubs, Cambridge
- Methodist Church, Cambridge
- Mining, Cambridge
- Miscellaneous Household Item Repair, Cambridge
- Miscellaneous Government, Cambridge
- Miscellaneous Personal Services, Cambridge
- Miscellaneous Professional, Cambridge
- Motor Vehicle, Cambridge
- Motor Vehicle Rental & Leasing, Cambridge
- Motorcycle Parts, Accessories & Dealers, Cambridge
- Moving Supplies & Equipment Rental, Cambridge
- Moving Truck Rental , Cambridge
- Muffler Shop & Exhaust Systems, Cambridge
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