The value of all farms, rural land, hunting land and other land for sale in Illinois's DuPage County recently was almost $113 million, representing a combined 240 acres of land for sale in DuPage County. DuPage County ranks 25th out of 102 counties in Illinois for the total number of acres of land currently advertised for sale. Of all locations in DuPage County with land for sale, Naperville featured the most land for sale. DuPage County is the 87th largest county (336 square miles) in Illinois. It's located in the Chicagoland Illinois region of the state.