Of 102 counties in the Land of Lincoln, 1,186-square-mile McLean County ranks third by size. McLean County is in the Central Illinois region. Recent listings of residential land for sale in McLean County, Illinois, totals nearly 1,000 acres and a combined market value of around $9 million. The most common type of land for sale by combined acreage in McLean County is undeveloped land. The average price of residential acreage for sale in McLean County was $401,490. 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.