Land for sale in Illinois's Ogle County recently totaled around $34 million and approximately 2,000 acres. Ogle County ranks 21st out of 102 counties in the Inland Empire for the total number of acres of land currently advertised for sale. Among cities in Ogle County with farms and rural real estate for sale, Oregon had the most land for sale. Ogle County is the 19th biggest county (763 square miles) in Illinois. It's located in the Northern Illinois region of the state.