- Machine Shop & Tool Repair Service, Winthrop Harbor
- Machinery, Supplies & Equipment - Business Supplies Related, Winthrop Harbor
- Maintenance, Cleaning & Sanitation, Winthrop Harbor
- Manufacturers Agents & Representatives, Winthrop Harbor
- Manufacturers Representative, Winthrop Harbor - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Winthrop Harbor
- Marinas & Marina Services, Winthrop Harbor
- Marine Electronic Equipment, Winthrop Harbor
- Marine Supplies & Equipment, Winthrop Harbor - Boat Supplies
- Medical Supplies & Equipment, Winthrop Harbor
- Membership Sports & Recreation Clubs, Winthrop Harbor
- Methodist Church, Winthrop Harbor
- Mexican Restaurants, Winthrop Harbor
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- Mildew Removal & Control, Winthrop Harbor - Mold Removal
- Miscellaneous Household Item Repair, Winthrop Harbor
- Miscellaneous Government, Winthrop Harbor
- Miscellaneous Manufacturing, Winthrop Harbor
- Miscellaneous Personal Services, Winthrop Harbor
- Miscellaneous Photographers, Winthrop Harbor
- Motor Vehicle, Winthrop Harbor
- Motor Vehicle Rental & Leasing, Winthrop Harbor
- Motorcycle Parts, Accessories & Dealers, Winthrop Harbor
- Moving Companies, Winthrop Harbor
- Moving Services - Labor & Material, Winthrop Harbor
- Moving Truck Rental , Winthrop Harbor
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