There was a total of $8 million of farms, rural land, hunting land and other land for sale in Mercer County recently on Land.com. The total size of all Mercer County land for sale was almost 2,000 acres. Mercer County ranks 88th out of 102 counties in Illinois for the total number of acres 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, hunting land and other rural land and acreage for sale in Mercer County, Joy featured the most land for sale. Mercer County is the 44th biggest county (568 square miles) in Illinois. It's located in the Western Illinois region of Illinois.