San Jacinto (/ˌsæn həˈsɪntoʊ, jəˈsɪntoʊ/ SAN hə-SIN-toh, yə-SIN-toh; Spanish: [san xaˈsinto]; Spanish for "St. Hyacinth") is a city in Riverside County, California. It is located at the north end of the San Jacinto Valley, with Hemet to its south and Beaumont, California, to its north. The mountains associated with the valley are the San Jacinto Mountains. The population was 44,199 at the 2010 census. The city was founded in 1870 and incorporated on April 20, 1888, making it one of the oldest cities in Riverside County.