Riverside is a city in Riverside County, California, United States, located in the Inland Empire metropolitan area. Riverside is the county seat of the eponymous county and named for its location beside the Santa Ana River. It is the most populous city in the Inland Empire as well as Riverside County, and is located approximately east of Los Angeles. It is also part of the Greater Los Angeles area. Riverside is the 59th most populous city in the United States and  12th most populous city in California. As of the 2010 Census, Riverside had a population of 303,871.