This is a list of area codes in California with service territory and installation dates. 209 – Stockton, Modesto, Merced, Turlock; the northern San Joaquin Valley and the central Sierra Nevada range. (Split from 415 on October 26, 1957; split off 559 on November 14, 1998; overlaid with 350 on November 28, 2022) 213 – Much of the City of Los Angeles and several inner suburbs (October 1947; split numerous times since then, including a split to form code 323 on June 13, 1998; in August 2017, the boundary between 213 and 323 was erased to form an overlay) 279 – overlay with 916, started service on March 10, 2018. 310 – The western and southwestern parts of Los Angeles County, including the Westside and South Bay regions. These include the cities and towns of Santa Monica, Malibu, Pacific Palisades, Compton, Torrance, Beverly Hills and Catalina Island. (Split from 213 on November 2, 1991; overlaid by 424 on August 26, 2006) 323 – Much of the City of Los Angeles and several inner suburbs (originally split off from 213 to form a ring around downtown Los Angeles and the city of Montebello on June 13, 1998; in August 2017, the boundary between 213 and 323 was erased to form an overlay) 341 – overlay with 510, started service on July 22, 2019. 350 - overlay with 209, started service on November 28, 2022. 408 – San Jose, Sunnyvale, Gilroy, Morgan Hill, and Los Gatos; most of Santa Clara County. (Split from 415 on January 1, 1959; overlaid by 669 on November 20, 2012) 415 – San Francisco, San Rafael, Novato; all of San Francisco County, most of Marin County and a small portion of northern San Mateo County (October 1947; split numerous times since then; overlaid by 628 effective March 21, 2015) 424 – overlay with 310, started service on August 26, 2006. 442 – overlay with 760, started service on October 24, 2009. 510 – Oakland, Fremont, Hayward, Berkeley and Richmond; western Alameda and Contra Costa Counties. (Split from 415 on September 2, 1991; overlaid by 341 on July 22, 2019) 530 – Redding, Chico, Davis, Marysville, Red Bluff, Oroville, Placerville, Truckee, Yuba City; northeastern California including most of the Sacramento Valley, the northern Sierra Nevada and the Lake Tahoe region. (Split from 916 on November 1, 1997) 559 – Fresno, Visalia, Madera, Hanford; the central San Joaquin Valley