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Riverside County, California
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.
- "State & County QuickFacts". United States Census Bureau. http://quickfacts.census.gov/qfd/states/06/06065.html. Retrieved April 6, 2016.
- "Find a County". National Association of Counties. http://www.naco.org/Counties/Pages/FindACounty.aspx. Retrieved June 7, 2011.