Iron County is a county in the Upper Peninsula of Michigan. As of the 2020 Census, the population was 11,631. The county seat is Crystal Falls.
Iron County was organized in 1885, with territory partitioned from Marquette and Menominee counties. In 1890, the county's population was 4,432. It was named for the valuable iron ore found within its borders.
According to the U.S. Census Bureau, the county has an area of 1,211 square miles, of which 1,166 square miles is land and 45 square miles (3.7%) is water. Along with its southeastern neighbor Dickinson County, it is one of only two landlocked counties in the Upper Peninsula.