Riverside County is a county located in the southern portion of the U.S. state of California. As of the 2020 census, the population was 2,418,185, making it the fourth-most populous county in California and the 10th-most populous in the United States. The name was derived from the city of Riverside, which is the county seat.
Country: United States
State: California
Region: Inland Empire
Incorporated: May 9, 1893
Named for: The City of Riverside, and the city's location beside the Santa Ana River
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