The Village of Tinley Park took part in the 2020 United States Census, which officially began with National Census Day on April 1, 2020. The data collected helps determine the number of seats Illinois has in the U.S. House of Representatives and the amount of federal funds received for such things as schools, senior centers and public works projects. It also is the basis for many state revenue payments, such as income tax and motor fuel fax.
The last census, held on April 1, 2010, determined the population of Tinley Park was 56,703.
The Clerk's Office coordinates both the decennial and special census.