Deer Park is a village in Lake and Cook counties, Illinois, United States. Per the 2020 census, the population was 3,681. The village is one of the few left in the Chicago area that enjoy a green belt which is bordered by two large natural areas providing outdoor recreation and open space. The village is home to popular shopping and dining destinations: Deer Park Town Center and the Town Center Promenade. The town is also home to the Vehe Farm, an Illinois Centennial Farm.