Stockton is a city in and the county seat of San Joaquin County in the Central Valley of the U.S. state of California. It is the most populous city in the county, the 11th-most populous city in California and the 60th-most populous city in the United States. Stockton's population in 2020 was 320,804. It was named an All-America City in 1999, 2004, 2015, and again in 2017 and 2018. The city is located on the San Joaquin River in the northern San Joaquin Valley. It lies at the southeastern corner of a large inland river delta that isolates it from other nearby cities such as Sacramento and those of the San Francisco Bay Area.