Union County is in Central Ohio. Of the 88 counties in the Buckeye State, 279,598-acre Union County ranks 49th by size. The most common type of land for sale by combined acreage in Union County is residential property. Browse all waterfront property for sale in Union 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!