Iron Mountain is a city in and the county seat of Dickinson County, Michigan. The population was 7,518 at the 2020 census, down from …Iron Mountain is a city in and the county seat of Dickinson County, Michigan. The population was 7,518 at the 2020 census, down from 7,624 at the 2010 census. Located in the state's Upper Peninsula, Iron Mountain was named for the valuable iron ore found in the vicinity.
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