- Machine Shop & Tool Repair Service, Superior
- Machinery, Supplies & Equipment - Construction & Contractor Related, Superior
- Management Consultants & Services, Superior
- Manufacturing, Superior
- Marriage & Family Counselors, Superior
- Masonry Materials & Supplies, Superior
- Medical Groups & Clinics, Superior - Medical & Health Centers
- Medical Research, Superior
- Medical Research & Development, Superior - Medical Information & Research
- Mental Health Clinics, Superior - Treatment Centers
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- Mental Health Specialists, Superior - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Superior
- Miscellaneous Government, Superior
- Miscellaneous Industry, Superior
- Mortgage Bankers & Correspondents, Superior
- Mortgage Contracts & Services, Superior
- Mortgages & Loans, Superior
- Motor Vehicle, Superior
- Mulch, Peat & Moss Products, Superior
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