805

Area code 805 is a key telephone area code in the United States, particularly serving parts of California. Establishment and Coverage Area: Area code 805 was split from area code 213 in 1957. It covers parts of several counties in California, including San Luis Obispo, Santa Barbara, Ventura, and Monterey. The coverage area of this area code includes significant cities like Ventura, Bakersfield, Paso Robles, Oxnard, and Thousand Oaks, as well as counties like Ventura County, Santa Barbara County, San Luis Obispo County, Kern County, and Los Angeles County​​​​. Overlay with Area Code 820: In 2017, area code 820 was added as an overlay to area code 805. An overlay is a telecommunications practice where an additional area code covers the same geographic area as an existing area code, allowing for a greater allocation of phone numbers within the same geographical area​​​​. International Usage: Interestingly, area code 805 is also utilized by the US military in Kwajalein, Republic of the Marshall Islands, highlighting its unique application beyond the typical geographical boundaries of most area codes​​. In summary, area code 805 is integral to the telecommunications network in parts of California, covering multiple counties and key cities. Its establishment as a split from area code 213 and subsequent overlay with area code 820 reflects the evolving telecommunications needs in the region. Additionally, its use by the US military in an international context underscores its versatility and importance.