- Machinery, Supplies & Equipment - Business Production Related, Kewaunee
- Machinery, Supplies & Equipment - Construction & Contractor Related, Kewaunee
- Major Appliances, Kewaunee - Household & Kitchen
- Management Consultants & Services, Kewaunee
- Manufacturing, Kewaunee
- Manufacturing Products, Kewaunee
- Marinas & Marina Services, Kewaunee
- Medical Research, Kewaunee
- Medical Research & Development, Kewaunee - Medical Information & Research
- Membership Sports & Recreation Clubs, Kewaunee
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- Mini Golf Courses, Kewaunee
- Miscellaneous Government, Kewaunee
- Miscellaneous Professional, Kewaunee
- Mortgage Bankers & Correspondents, Kewaunee
- Mortgage Contracts & Services, Kewaunee
- Motor Vehicle, Kewaunee
- Motor Vehicle Rental & Leasing, Kewaunee
- Motorcycle Parts, Accessories & Dealers, Kewaunee
- Moving Supplies & Equipment Rental, Kewaunee
- Moving Truck Rental , Kewaunee
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