- Machine Shop & Tool Repair Service, Thornton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Thornton
- Manufacturing, Thornton
- Manufacturing Products, Thornton
- Masonry Contractors, Thornton - Stone Mason, Brick Mason - Install & Repair
- Mechanical Contractors, Thornton - Install, Service & Repair
- Membership Sports & Recreation Clubs, Thornton
- Metal Repair Service & Blacksmith, Thornton - Iron Works
- Methodist Church, Thornton
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