Of 99 counties in the state, Marion County ranks 55th by size (570 square miles). Marion County is in Central Iowa. The total value of roughly 1,000 acres of riverfront homes and property recently listed for sale in Iowa's Marion County was roughly $600,000. Browse all waterfront property for sale in Marion 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! The most common type of land for sale by combined acreage in Marion County is residential property.