Area code 951 is a California telephone area code that was split from area code 909 on July 17, 2004. It covers western North and South Riverside County, including, Beaumont, Corona, Canyon Lake, Riverside, Temescal Canyon, Woodcrest, Arlington, Mira Loma, Moreno Valley, Perris, Sun City, Lake Elsinore, Wildomar, Murrieta, Temecula, San Jacinto, Hemet, Lakeview, Nuevo, Norco, Banning, Eastvale, Quail Valley, and Idyllwild.