- Machine Shop & Tool Repair Service, Walworth
- Machinery, Supplies & Equipment - Business Supplies Related, Walworth
- Machinery, Supplies & Equipment - Construction & Contractor Related, Walworth
- Mail Delivery Service, Walworth
- Management Consultants & Services, Walworth
- Manufacturing, Walworth
- Manufacturing Products, Walworth
- Marketing Consultants Professional Practices, Walworth
- Masonry Contractors, Walworth - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Walworth
- Merchandise Sales Events, Walworth
- Miscellaneous Government, Walworth
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- Miscellaneous Personal Services, Walworth
- Miscellaneous Professional, Walworth
- Mortgage Bankers & Correspondents, Walworth
- Motor Vehicle, Walworth
- Motor Vehicle Rental & Leasing, Walworth
- Motorcycle & ATV Repair & Service, Walworth
- Motorcycle & Motor Scooters Dealers, Repair & Service, Walworth
- Motorcycle Parts, Accessories & Dealers, Walworth
- Motorcycle Repair & Service, Walworth
- Moving Supplies & Equipment Rental, Walworth
- Moving Truck Rental , Walworth
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