Tinley Park is a village located in Cook County, Illinois, United States, with a small portion in Will County. According to the United States Census of 2010, the estimated population of this city was 56,703. It is considered to be 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.