Ironwood is a city in Gogebic County in the Upper Peninsula of the U.S. state of Michigan, about 18 miles (29 km) south of Lake Superior. The city is on US Highway 2 across the Montreal River from Hurley, Wisconsin. It is the westernmost city in Michigan, situated on the same line of longitude as Clinton, Iowa, and St. Louis, Missouri. The population was 5,045 at the 2020 census, down from 5,387 at the 2010 census. The city is bordered by Ironwood Township to the north, but the two are administered autonomously.