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Westlake Village is a planned community that straddles the Los Angeles and Ventura county line. The eastern portion is the incorporated city Westlake Village, located on the western edge of Los Angeles County, California. The city, located in the region known as the Conejo Valley, encompasses half of the area surrounding Westlake Lake, and small neighborhoods primarily south of U.S. Route 101 and east of La Venta Drive. The population was 8,270 at the 2010 census, down from 8,368 at the 2000 census. It is also the headquarters of the Dole Food Company. Westlake Village is known for its affluence and secluded character, and is considered one of the wealthiest communities in the Greater Los Angeles Area.

The western portion of Westlake Village is a community, within the city limits of Thousand Oaks, in Ventura County. It is important to note, the properties and businesses in this portion of Westlake Village are actually recorded in the Ventura County Recorder's office as "Westlake Village", as the United States Post Office maps the 91362 ZIP code to both cities. Most residents recognize the community of Westlake Village as not limited to the incorporated city in Los Angeles County, but encompassing the entire area surrounding the lake on both sides of the county line.

The original community was known simply as "Westlake". Roughly two-thirds of it was annexed by the city of Thousand Oaks in two portions, in 1968 and 1972. In 1981, the remaining third eventually incorporated as the City of Westlake Village.