Of 67 counties in the state, Union County ranks 67th in terms of size (249 square miles). Union County is in North Central Florida. Florida's Union County includes about 1,000 acres of lakefront land and property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was almost $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 house.