Simonton is a city in Fort Bend County, Texas, United States, within the Houston–Sugar Land–Baytown metropolitan area. Simonton is located at the intersection of Farm roads 1093 and 1489, approximately fourteen miles northwest of Richmond and five miles west of Fulshear. As of the 2020 U.S. Census, the city population was 647, down from 814 at the 2010 census.