Oak Lawn Homes for Sale offers Southwest Chicago beauty in the suburbs. View Oak Lawn Real Estate and Homes for Sale market insider and listing today! Oak Lawn is a community in Cook County on Illinois states. According to 2010 census the population of this village was 56,690. Oak Lawn is a colony of Chicago, situated southwest of the city. It shares borders with the city in two areas, but is enclosed mostly by other suburbs. The median income for a household in the village was $47,585, where the median income for a family was $60,057 and 23,877 dollars was the per capita income for the village. 5.4% of the population was below the poverty line. The village government consists of a village president and six village trustees. Oak Lawn is in Illinois’ 3rd congressional district.