Ironton is a city in the U.S. state of Ohio and the county seat of Lawrence County. The municipality is located in southern Ohio along the Ohio River. The population was 11,211 at the 2000 census. Ironton is a part of the Huntington-Ashland, WV-KY-OH, Metropolitan Statistical Area (MSA). As of the 2000 census, the MSA had a population of 288,649. Ironton is one of the few cities in the MSA with an increase in population. As of 2005, the Census Bureau estimated that Ironton had a population of 11,417.