Riverside County, California facts for kids
Riverside County is one of fifty-eight counties in the U.S. state of California. According to the 2010 census, there were 2,189,641 people living there. It is the 4th-most populous county in California. It's also the 11th-most populous in the whole country. The name came from the city of Riverside, which is its county seat.
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Riverside County, California Facts for Kids. Kiddle Encyclopedia.