Iron City is a census-designated place and former city in Lawrence and Wayne counties, Tennessee. Iron City was incorporated as a city from 1887 to 1901, and again from 1962 until 2010, its residents voting to disincorporate in the latter year. The United States Census bureau treated the community as a Census-designated place for both the 2010 and 2020 census. It had a population of 328 in 2010 and 274 in 2020.