Oak Creek is a city in Milwaukee County, Wisconsin, United States. It sits on the southwestern shore of Lake Michigan and is located immediately south of Milwaukee. The population was 36,497 at the 2020 census. In 2011, the city was one of the fastest growing in Milwaukee County and all of Wisconsin. The area has experienced an economic boom in recent years, with the addition of large companies such as Amazon, IKEA, the Astronautics Corporation of America & Meijer