- Machine Shop & Tool Repair Service, Windsor
- Machinery, Supplies & Equipment - Business Production Related, Windsor
- Machinery, Supplies & Equipment - Construction & Contractor Related, Windsor
- Manufacturing, Windsor
- Masonry Materials & Supplies, Windsor
- Mechanical Contractors, Windsor - Install, Service & Repair
- Medical & Health Service Organizations, Windsor
- Medical Groups & Clinics, Windsor - Medical & Health Centers
- Medical Supplies & Equipment, Windsor
- Membership Sports & Recreation Clubs, Windsor
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- Mental Health Specialists, Windsor - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Services, Windsor
- Millwork Contractors, Windsor
- Miscellaneous Agriculture, Windsor
- Miscellaneous Industry, Windsor
- Motor Vehicle, Windsor
- Motor Vehicle Rental & Leasing, Windsor
- Museums, Windsor
- Music, Windsor
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