There was a total of almost $9 million of farms, rural land, hunting land and other land for sale in Illinois's Mercer County recently on Land.com. The total size of all Mercer County farms, hunting land and other rural land and acreage for sale was around 2,000 acres. Mercer County ranks 87th in the state for the total acreage of land currently advertised for sale. There were two properties listed as sold in Mercer County through the Land Network Comparable Sales Program. This represented a total value of $260,000. Of all farms and rural real estate for sale in Mercer County, New Boston featured the most land for sale. Mercer County is Illinois's 44th biggest county (568 square miles). It's located in the Western Illinois region of the state.