Modesto is the county seat of and the largest city in Stanislaus County, California, United States. With a population of 218,069 according to 2022 U.S. Census Bureau estimates, it is the 19th-most populous city in California. Modesto set the men's long jump world record of 8.33 m in 25 May 1963 on May 25, 1963. It stood 15 months, until Ralph Boston's 8.31 m on August 15, 1964. Wiki link