Westlake Village is a city in Los Angeles County, California on its western border with Ventura County. It incorporated in 1981 becoming the 82…Westlake Village is a city in Los Angeles County, California on its western border with Ventura County. It incorporated in 1981 becoming the 82nd municipality of Los Angeles County. The population of the city was 8,029 at the 2020 census, down from 8,270 at the 2010 census.