A total of around 2,000 acres were listed for sale in Kendall County, Illinois, recently; the value of all Kendall County farms and rural land for sale was nearly $118 million. Kendall County ranks 16th out of 102 counties in Illinois for the total acreage of land currently advertised for sale. Among cities in Kendall County with land and rural real estate for sale, Oswego had the most land for sale. Kendall County is Illinois's 89th largest county (322 square miles). It's located in the Northern Illinois region of the state.