Grundy County is in Northern Illinois. Of the 102 counties in the Inland Empire, 430-square-mile Grundy County ranks 70th by size. Recent listings of residential land and property for sale in Illinois's Grundy County totals approximately 1,000 acres and a combined market value of almost $14 million. The most common type of land for sale by combined acreage in Grundy County is residential property. The average price of residential land for sale in Grundy County was $446,912. 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.