Tinley Park is a village located in Cook County, Illinois, United States, with a small portion in Will County. The population was 56,703 at the 2010 census. It is one of the fastest growing suburbs southwest of Chicago. In 2009, Tinley Park was selected by BusinessWeek as the best place to raise a family in America. In 2017, Tinley Park was listed as one of the 50 safest cities in America.