Riverside is a city in southern California, United States. It is the county seat of Riverside County and is named for its location beside the Santa Ana River. It is the most populous city in the Inland Empire and in Riverside County, and it is also part of the Greater Los Angeles area.
Riverside is the 60th most populous city in the United States and the 12th most populous city in California. As of the 2010 Census, Riverside had a population of 303,871.