Area codes 760 and 442 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. These area codes serve an overlay numbering plan area (NPA) that comprises much of the southeastern and southernmost portions of California. It includes Imperial, Inyo, and Mono counties, as well as portions of San Diego, Riverside, San Bernardino, Los Angeles and Kern counties. Area code 760 was created on March 22, 1997 in a split of area code 619. Area code 442 was added to the same area on November 21, 2009. History Area code 760 was split from 619 in 1997, which in turn had been split from area code 714 in 1982. Within a decade of its creation, however, the proliferation of cell phones and pagers left 760 strained to the point that a new area code was needed for the area. The initial plan was a further area code split, with the San Diego and Imperial portions moving to a new 442 area code. However, this met with protests from businesses who did not want to change their numbers for the second time in a decade. Ultimately, the California Public Utilities Commission decided that 442 would be added as an overlay to 760 instead, and since 2009 all users in the region have been required to include the area code even when dialing local calls. At , it is the largest area code in California with approximately 29% of the state served by area codes 760 and 442. Manual service Areas within this area code which had manual service in the past include: Death Valley Junction (Inyo County) Kelso (San Bernardino County) Stovepipe Wells, Death Valley (Inyo County) Rate centers Rate centers located in area codes 442/760: Imperial County Andrade Bombay Beach Brawley Calexico Calipatria Desert Shores El Centro Heber Holtville Imperial Mount Signal Niland Ocotillo Ogilby Palo Verde Plaster City Salton City Salton Sea Beach Seeley Westmorland Winterhaven Inyo County Ballarat Big Pine Bishop Cartago Darwin Death Valley Junction Dixon Lane-Meadow Creek Furnace Creek Homewood Canyon-Valley Wells Independence Keeler Laws Lone Pine Mesa Olancha Panamint Springs Pearsonville Round Valley Shoshone Tecopa West Bishop Wilkerson Kern County Bodfish Boron California City Cantil China Lake Acres Inyokern Johannesburg Kernville Lake Isabella Mountain Mesa Onyx Randsburg Ridgecrest South Lake Squirrel Mountain Valley Weldon Wofford Heights Los Angeles County Big Pines Jackson Lake Mono County Benton Bodie Bridgeport