Of 102 counties in the Prairie State, McLean County ranks third in terms of size (1,186 square miles). McLean County is in the Central Illinois region. Recent listings of residential land for sale in McLean County, Illinois, totals almost 1,000 acres and a combined market value of about $10 million. The most common type of land for sale by combined acreage in McLean County is undeveloped land. The average price of residential land for sale in McLean County was $382,215. 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.