Mountain Iron is a city in Saint Louis County, Minnesota, United States; in the heart of the Mesabi Range. The population was 2,869 at the 2010 census.
U.S. Highway 169 serves as a main route in Mountain Iron.
The city's motto is the "Taconite Capital of the World". The local mine, Minntac, is owned by the United States Steel Corporation (U.S. Steel).
Mountain Iron is part of the Quad Cities of Virginia, Eveleth, and Gilbert.
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