Mercer County is in Western Illinois. Of the 102 counties in the Prairie State, 363,963-acre Mercer County ranks 44th by size. Recent listings of farms for sale in Mercer County, Illinois, totals nearly 1,000 acres and a combined market value of almost $800,000. The most common type of land for sale by combined acreage in Mercer County is residential property. The average price of farmland for sale in Mercer County was $362,500. Farms for sale in Mercer County hold livestock including horses, cattle, goats, sheep and pig. Browse all Illinois farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future commercial or individual needs.