About
Union County, with its gently undulating land, embraces 346 square miles with a population of 15,637 on the western edge of the Western Coal Field. Along its northern and western borders, for a distance of approximately 36 miles, the Ohio River flows in majestic curves. In the southwest, Union County is separated from Crittenden County by the Tradewater River. Webster County borders the southeast section and to the northeast lies Henderson County, from which Union County was formed in 1811.