There was a combined around $41 million of land for sale in Illinois's Boone County recently on Land.com. The total acreage of all Boone County land and rural real estate for sale was around 1,000 acres. Boone County ranks 16th out of 102 counties in the Land of Lincoln for the combined amount of land currently advertised for sale. Among cities in Boone County with farms, hunting land and other rural land and acreage for sale, Belvidere had the most land for sale. Manufacturing and related services are the largest economic sectors in Boone County. Boone County is the 94th biggest county (282 square miles) in Illinois. It's located in the Northern Illinois region of Illinois.