Union County, KY
History
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.The county is located on the Ohio River opposite 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.
Source: Wikipedia
Modern Day Adjacent Counties
Posey County, Indiana (north)Henderson County (northeast)
Webster County (southeast)
Crittenden County (south)
Hardin County, Illinois (west)
Gallatin County, Illinois (northwest)