- Machine Shop & Tool Repair Service, Northbridge
- Machinery, Supplies & Equipment - Business Production Related, Northbridge
- Major Appliances, Northbridge - Household & Kitchen
- Malls & Shopping Centers, Northbridge
- Management Consultants & Services, Northbridge
- Manicurists & Pedicurists, Northbridge
- Manufacturing, Northbridge
- Manufacturing Products, Northbridge
- Marriage & Family Counselors, Northbridge
- Martial Arts & Self Defense Schools, Northbridge
- Mechanical Engineer, Northbridge - Mechanical Engineering Service
- Medical Supplies & Equipment, Northbridge
- Membership Sports & Recreation Clubs, Northbridge
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- Mental Health Specialists, Northbridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Northbridge
- Miscellaneous Fabricated Wire Products Manufacturers, Northbridge
- Miscellaneous Household Item Repair, Northbridge
- Miscellaneous Manufacturing, Northbridge
- Miscellaneous Personal Services, Northbridge
- Miscellaneous Professional, Northbridge
- Motor Vehicle, Northbridge
- Motor Vehicle Rental & Leasing, Northbridge
- Music, Northbridge
- Musical Instrument Manufacturers, Northbridge
- Musical Instruments & Equipment Stores, Northbridge
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