Mercer County is in Northwest Ohio. Of the 88 counties in the Buckeye State, Mercer County ranks 37th in terms of size (473 square miles). Recent listings of residential land and property for sale in Mercer County, Ohio, totals around 1,000 acres and a combined market value of approximately $7 million. The most common type of land for sale by combined acreage in Mercer County is house. The average price of residential acreage for sale in Mercer County was $420,171. Browse all residential land and rural property for sale in Ohio to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.