Crest Hill is a city in Lockport Township, Will County, Illinois, United States. The 2010 census put Crest Hill's population at 20,837.
Crest Hill is located at 41°33′52″N 88°6′31″W (41.5645, -88.1089). Crest Hill decided to incorporate itself to avoid being annexed by the City of Joliet and became officially incorporated as the City of Crest Hill January 22, 1960.
According to the 2010 census, Crest Hill has a total area of 9.166 square miles (23.74 km2), of which 9.03 square miles (23.39 km2) (or 98.52%) is land and 0.136 square miles (0.35 km2) (or 1.48%) is water.
At the 2000 census, there were 13,329 people, 4,478 households and 2,758 families residing in the city. The population density was 1,861.2 per square mile (718.8/km2). There were 4,808 housing units at an average density of 671.4 per square mile (259.3/km2). The racial makeup of the city was 69.4% (White Non-Hispanic) 19.6% (African American), 8.8% (Hispanic), 3.2% (Other), 1.4% (Two or more races), .5% (American Indian). Total can be more than 100% because Hispanics could be counted in other races.
There were 4,478 households, of which 30.2% had children under the age of 18 living with them, 45.1% were married couples living together, 12.0% had a female householder with no husband present, and 38.4% were non-families. 30.9% of all households were made up of individuals, and 7.9% had someone living alone who was 65 years of age or older.