Of 99 counties in the Hawkeye State, Madison County ranks 61st by size (562 square miles). Madison County is in Central Iowa. Madison County, Iowa, includes roughly 1,000 acres of riverfront property for sale based on recent Land Network data. The combined market value of farms and ranches for sale here was roughly $500,000. Browse all waterfront property for sale in Madison 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 Madison County is undeveloped land.