Hanover Park is a village in Cook and DuPage counties in the U.S. state of Illinois, a suburb of Chicago. The population was 37,470 at the 2020 census. Ontarioville is a neighborhood within the village.

Township High School District 211 is a school district located in Cook County, Illinois, and is the largest high school district in Illinois. District 211 serves the communities of Hoffman Estates, Inverness, Palatine, and Schaumburg, and portions of Arlington Heights, Elk Grove, Hanover Park, Roselle, Rolling Meadows, Streamwood, and South Barrington in the northwest suburbs of Chicago.