- Manufacturing, Ecorse
- Marine Products And Services, Ecorse
- Marine Repair & Service Stations, Ecorse
- Marine Supplies & Equipment Repair, Ecorse - Boat Supplies & Equipment
- Mexican Restaurants, Ecorse
- Miscellaneous Household Item Repair, Ecorse
- Miscellaneous Government, Ecorse
- Miscellaneous Professional, Ecorse
- Mission Churches, Ecorse
- Mobile Home Parks & Communities , Ecorse
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