Whiteside County is in Northern Illinois. Of the 102 counties in the Prairie State, Whiteside County is 27th in terms of its size (445,776 acres). A recent survey of Land Network data shows roughly 1,000 acres of residential land and property for sale in Illinois's Whiteside County, which is valued at a combined $6 million. The average price of residential acreage for sale in Whiteside County was $316,004. Browse all residential land and rural property for sale in Illinois to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.