Union County (Kentucky)

Union County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 15,007. Its county seat is Morganfield. The county was formed on January 15, 1811.Located at the mouth of the Wabash River, Union County, along with neighboring Posey County, Indiana, and Gallatin County, Illinois form the tri-point of the Illinois-Indiana-Kentucky Tri-State Area.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (5.6%) is water. Union County is part of the Western Coal Fields region of Kentucky. The county's northwestern border with Illinois and Indiana is formed by the Ohio River.Adjacent counties Posey County, Indiana (north) Henderson County (northeast) Webster County (southeast) Crittenden County (south) Hardin County, Illinois (west) Gallatin County, Illinois (northwest)