Oak Lawn is a village in Cook County, Illinois, United States. The population was 56,690 at the 2010 census.Oak Lawn is a suburb of Chicago, located southwest of the city. It shares borders with the city in two areas, but is surrounded mostly by other suburbs.
John Simpson, a prominent figure in early Oak Lawn history, bought the northern half of the property in 1842. By 1859, the recently incorporated government of Worth Township paid for the construction of Black Oak Grove Road, an early name for 95th Street. Black Oak Grove is also the earliest known name of the area that would become Oak Lawn.It was later shortened to Black Oak or Black Oaks, but in 1882, the post office, train depot and surrounding community became known simply as Oak Lawn. Over the next two decades, the area grew in population as more homes were built and local business sprang into being.In 1909, Oak Lawn officially became an incorporated village. The following years saw major improvements to local infrastructure and government services.