Cass County is in Western Illinois. Of the 102 counties in the Land of Lincoln, 383-square-mile Cass County ranks 78th by size. Recent listings of residential land for sale in Cass County, Illinois, totals 1,000 acres and a combined market value of roughly $500,000. The most common type of land for sale by combined acreage in Cass County is hunting land. The average price of residential acreage for sale in Cass County was $163,299. 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.