Mercer County is in Northwest Missouri. Of the 115 counties in the Ozark State, Mercer County is 95th in terms of its size (455 square miles). The most common type of land for sale by combined acreage in Mercer County is farms. Browse all waterfront property for sale in Mercer County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits!