Dickinson County is a county in the Upper Peninsula of the U.S. state of Michigan. As of the 2020 census, the population was 25,947. The county seat is Iron Mountain. Dickinson is Michigan's newest county, formed in 1891 from parts of Marquette, Menominee, and Iron counties. It was named for Donald M. Dickinson, who served as U.S. Postmaster General under President Grover Cleveland.

Iron Mountain is a city 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. In the state's Upper Peninsula, Iron Mountain was named for the valuable iron ore found in the vicinity.