Of 67 counties in the state, Union County ranks 64th by size (317 square miles). Union County is in Alleghenies & Valleys Pennsylvania. The total value of roughly 1,000 acres of lakefront land and property recently listed for sale in Union County, Pennsylvania, was roughly $800,000. 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! The most common type of land for sale by combined acreage in Union County is residential property.