The El Cerrito Branch Library serves almost 200,000 residents in the city of Corona in Riverside County, California. It is one of the 35 libraries under the Riverside County Library System (RCLS), which was founded in 1911 as the Riverside County Free Library. El Cerrito Branch Library was opened in 2004 located at the middle school of El Cerrito in response to rising demand for library services and a larger area. It is the first joint-use library of the Corona-Norco School district and RCLS to provide a 10,000-square-foot building to provide exclusive access to students during school hours and access to other patrons after school time. Additionally, El Cerrito branch adds to the county system's overall resources, which include more than 47,000 books and serial volumes, nearly 13,000 e-books, more than 3,000 audio files, and nearly 7,000 video files. Also, the library system saw more than 83,000 visitors annually, more than 132,000 items circulated, and over 10,000 registered borrowers.