The value of farmsand rural real estate for sale in Hardin County recently on Land.com was almost $5 million. This represents 1,000 acres of farms, hunting land and other rural land and acreage for sale in Hardin County. Hardin County ranks 78th in the state for the total number of acres of land currently advertised for sale. Of all farms and rural land for sale in Hardin County, Elizabethtown had the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Illinois. Hardin County is the 101st largest county (181 square miles) in Illinois. It's located in the Southern Illinois region of the state.