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. Riverside County is included in the Riverside–San Bernardino–Ontario Metropolitan Statistical Area, also known as the Inland Empire. The county is also included in the Los Angeles–Long Beach Combined Statistical Area. Roughly rectangular, Riverside County covers 7,208 square miles in Southern California, spanning from the greater Los Angeles area to the Arizona border. Geographically, the western region of the county is chaparral with a Mediterranean climate, while the central and eastern regions of the county are predominantly desert or mountainous. Most of Joshua Tree National Park is located in the county.

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
County seat: Riverside
Largest city (population): Riverside
Type: Council–CEO
Chair: Chuck Washington
Vice Chair: V. Manuel Perez
Chief executive officer: Jeff Van Wagenen
Population (2020): 2,418,185
Time zone: Pacific Time Zone (UTC−8)
Summer (DST): Pacific Daylight Time (UTC−7)
FIPS code: 06-065
Congressional districts: 25th, 35th, 39th, 40th, 41st, 48th
Website: www.CountyOfRiverside.us
Official Website: http://www.countyofriverside.us
Wikidata description: county in California, United States
Wikidata id: Q108111
Wikidata label: Riverside County
Wikidata aliases: Array
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