Located in Central Illinois, 1,119-square-mile Iroquois County is one of the ten biggest counties in the state. Recent Land Network data totals almost 1,000 acres of residential land and property for sale in Illinois's Iroquois County, which is valued at a combined $9 million. The average price of residential land for sale in Iroquois County was $423,713. The county has a rural, farm-based economy. 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.