Westlake Village is a planned community that crosses 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. The city, located in the Conejo Valley, encompasses half of the area surrounding Westlake Lake, and small neighborhoods primarily south of 101 highway and east of La Venta Drive. According to the 2010 Census the population is 8,270. 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. The properties and businesses in this portion can be addressed as “Westlake Village”, as the United States Post Office maps both 91361 and 91362 ZIP codes to this area. Built across the county line as a planned development, residents recognize that the community of Westlake Village is not limited to the incorporated city in Los Angeles County, but encompassing the entire area surrounding the lake.
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.
Information source: Wikipedia