- Machine Shop & Tool Repair Service, Springfield
- Machinery, Supplies & Equipment - Business Production Related, Springfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Springfield
- Manufacturing, Springfield
- Manufacturing Products, Springfield
- Masonry Materials & Supplies, Springfield
- Mechanical Contractors, Springfield - Install, Service & Repair
- Medical Supplies & Equipment, Springfield
- Membership Sports & Recreation Clubs, Springfield
- Metal Buildings, Springfield - Kits, Homes, Steel Buildings, etc
- Metal Galvanizing, Springfield
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- Metal Repair Service & Blacksmith, Springfield - Iron Works
- Millwork Contractors, Springfield
- Mini & Self Storage, Springfield
- Mini Golf Courses, Springfield
- Mining Equipment & Supplies, Springfield
- Miscellaneous Manufacturing, Springfield
- Miscellaneous Personal Services, Springfield
- Motor Vehicle, Springfield
- Motor Vehicle Rental & Leasing, Springfield
- Moving Truck Rental , Springfield
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