Mercer County is in Northwest Missouri. Of the 115 counties in the state, Mercer County is 95th in terms of its size (455 square miles). Recent listings of residential land and property for sale in Missouri's Mercer County totals nearly 1,000 acres and a combined market value of $8 million. The most common type of land for sale by combined acreage in Mercer County is house. The average price of residential land for sale in Mercer County was $638,646. The county has a rural, farm-based economy. Browse all residential land and rural property for sale in Missouri 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.