Union County is in Western Kentucky. Of the 120 counties in the Bluegrass State, Union County ranks 42nd in terms of size (363 square miles). 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!