Ironwood is a city in Gogebic County in the U.S. state of Michigan, about south of Lake Superior. The population was 5,387 at the 2010 census. The city is on US 2 and is situated opposite the Montreal River from Hurley, Wisconsin. It is the westernmost city in Michigan, situated on the same line of longitude (90.2 degrees West) as Clinton, Iowa and St. Louis, Missouri.