- Machine Shop, Neillsville
- Machine Shop & Tool Repair Service, Neillsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Neillsville
- Mail Delivery Service, Neillsville
- Major Appliances, Neillsville - Household & Kitchen
- Management Consultants & Services, Neillsville
- Manufactured & Mobile Home Movers & Transporting, Neillsville
- Manufacturing, Neillsville
- Martial Arts & Self Defense Schools, Neillsville
- Masonry Materials & Supplies, Neillsville
- Massage Therapists & Professional, Neillsville
- Massage Therapy, Neillsville
- Metal Buildings, Neillsville - Kits, Homes, Steel Buildings, etc
- Millwork Contractors, Neillsville
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- Mini & Self Storage, Neillsville
- Miscellaneous Business Services, Neillsville
- Miscellaneous Government, Neillsville
- Miscellaneous Industry, Neillsville
- Miscellaneous Professional, Neillsville
- Mobile Home Parks & Communities , Neillsville
- Modular & Mobile Homes For Sale, Neillsville - Manufactured Homes Sale & Service
- Motor Vehicle, Neillsville
- Motor Vehicle Rental & Leasing, Neillsville
- Moving Supplies & Equipment Rental, Neillsville
- Moving Truck Rental , Neillsville
- Museums, Neillsville
- Musical Instruments Repair, Sales & Service, Neillsville
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