- Machinery, Supplies & Equipment - Business Production Related, North Chicago
- Machinery, Supplies & Equipment - Business Supplies Related, North Chicago
- Manicurists & Pedicurists, North Chicago
- Manufacturing, North Chicago
- Manufacturing Products, North Chicago
- Mausoleum Builders, North Chicago
- Medical Diagnostic Clinics, North Chicago - Clinical Labs & Centers
- Mental Health Specialists, North Chicago - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, North Chicago - Iron Works
- Metal Working Machinery, North Chicago
- Mexican Restaurants, North Chicago
- Millwork Contractors, North Chicago
- Miscellaneous Household Item Repair, North Chicago
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- Miscellaneous Government, North Chicago
- Miscellaneous Manufacturing, North Chicago
- Miscellaneous Professional, North Chicago
- Molds, North Chicago
- Monuments, Tombstones, Markers & Memorials, North Chicago
- Mortgage Bankers & Correspondents, North Chicago
- Motor Homes, North Chicago
- Motor Vehicle, North Chicago
- Motor Vehicle Rental & Leasing, North Chicago
- Moving Companies, North Chicago
- Moving Truck Rental , North Chicago
- Mulch, Peat & Moss Products, North Chicago
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