- Machine Shop & Tool Repair Service, Saint Charles
- Machinery, Supplies & Equipment - Construction & Contractor Related, Saint Charles
- Mail Delivery Service, Saint Charles
- Management Consultants & Services, Saint Charles
- Manufacturing, Saint Charles
- Manufacturing Products, Saint Charles
- Marriage & Family Counselors, Saint Charles
- Masonry Materials & Supplies, Saint Charles
- Meat Market, Wholesale & Products, Saint Charles
- Mental Health Specialists, Saint Charles - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Saint Charles - Iron Works
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- Methodist Church, Saint Charles
- Miscellaneous Government, Saint Charles
- Miscellaneous Personal Services, Saint Charles
- Miscellaneous Photographers, Saint Charles
- Miscellaneous Professional, Saint Charles
- Moravian Churches, Saint Charles
- Mortgage Bankers & Correspondents, Saint Charles
- Mortgage Contracts & Services, Saint Charles
- Motor Vehicle, Saint Charles
- Motorcycle Parts, Accessories & Dealers, Saint Charles
- Music, Saint Charles
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