Hanover Township is one of 29 townships in Cook County, Illinois, USA and is located at the end of the county's panhandle. As of the 2010 census, its population was 99,538.Hanover Township was established on April 2, 1850. The first reported population of the Township was 672. The Township gets its name from the "Kingdom of Hanover in Western Germany," which is where a majority of the Township's first residents originated from.