The combined value of farms and rural land for sale in Illinois's Mercer County recently on Land.com was nearly $4 million. This represents nearly 1,000 acres of farms, rural land, hunting land and other land for sale in Mercer County. Mercer County ranks 74th in the Prairie State for the combined amount 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 $320,010. Among cities in Mercer County with farms and rural land for sale, Aledo had 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 Illinois.