California Citrus State Historic Park is an open-air museum in the state park system of California, USA, interpreting the historic cultural landscape of the citrus industry. The story of the citrus industry's role in the history and development of California is told in the visitor center. The California Citrus State Historic Park is in the city of Riverside in Riverside County, California, United States. The 248-acre (100 ha) park was established in 1915.This California State Historic Park recaptures the time when "Citrus was King" in California, especially the Navel orange from Riverside, and recognizing the importance of the citrus industry in Southern California.