Grundy County is in Northern Illinois. Of the 102 counties in the Inland Empire, Grundy County is 70th in terms of its size (275,514 acres). Illinois's Grundy County includes roughly 1,000 acres of residential land for sale based on recent Land Network data. The combined market value of farmsand rural real estate for sale here was almost $17 million. The average price of residential land for sale in Grundy County was $452,143. 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.