Area code 951 is a California telephone area code that was split from area code 909 on July 17, 2004. It covers western Riverside County, including the cities and communities of Banning, Beaumont, Corona, Canyon Lake, Riverside, Temescal Valley, Woodcrest, Moreno Valley, Perris, Menifee, Lake Elsinore, Wildomar, Murrieta, Temecula, San Jacinto, Hemet, Lakeview, Nuevo, Norco, Eastvale, Jurupa Valley, and Idyllwild. History Until November 14, 1992, the area covered by 951 was part of area code 714. Area code 951 is currently the last new area code in California to have been split from another one. All codes introduced in the state since have been overlays. Prior to October 2021, area code 951 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021. List of cities and communities in the 951 area code Riverside County Aguanga Anza Banning Beaumont Cabazon Calimesa Canyon Lake Cherry Valley Corona East Hemet Eastvale Hemet Highgrove Home Gardens Homeland Idyllwild-Pine Cove Jurupa Valley Lake Elsinore Lakeland Village Lakeview March Air Reserve Base Menifee Moreno Valley Murrieta Norco Nuevo Perris Riverside San Jacinto Temecula Valle Vista Wildomar Winchester San Bernardino County Colton Fontana Grand Terrace See also List of California area codes List of NANP area codes North American Numbering Plan References External links North American Numbering Plan Administration Map List of exchanges from AreaCodeDownload.com, 951 Area Code Maps and Lists of area codes, also in Spanish and in French 951 Riverside County, California Inland Empire Telecommunications-related introductions in 2004 951