Union County, Illinois, is located in the southern part of the state, bordered by the Mississippi River to the west. Established in 1818, it is known for its rich agricultural land and natural beauty, including parts of the Shawnee National Forest. The county seat is Jonesboro, which is also the oldest town in the county. The population of Union County is relatively small, with a diverse community that values its rural lifestyle. The area offers various outdoor recreational activities, such as hiking and fishing, making it a popular destination for nature enthusiasts. The county is also home to several historical sites and local events that celebrate its heritage.