- Machine Shop & Tool Repair Service, Suamico
- Machinery, Supplies & Equipment - Business Production Related, Suamico
- Machinery, Supplies & Equipment - Business Supplies Related, Suamico
- Mail Delivery Service, Suamico
- Maintenance, Cleaning & Sanitation, Suamico
- Management Consultants & Services, Suamico
- Manufacturing, Suamico
- Manufacturing Products, Suamico
- Marinas & Marina Services, Suamico
- Marine Supplies & Equipment, Suamico - Boat Supplies
- Masonry Materials & Supplies, Suamico
- Membership Sports & Recreation Clubs, Suamico
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- Methodist Church, Suamico
- Mildew Removal & Control, Suamico - Mold Removal
- Miscellaneous Business Product Repair, Suamico
- Miscellaneous Government, Suamico
- Miscellaneous Manufacturing, Suamico
- Miscellaneous Personal Services, Suamico
- Miscellaneous Professional, Suamico
- Mortgage Bankers & Correspondents, Suamico
- Motor Vehicle, Suamico
- Motor Vehicle Rental & Leasing, Suamico
- Moving Supplies & Equipment Rental, Suamico
- Moving Truck Rental , Suamico
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