Find schools and get information on the program that’s right for you.
Powered by Campus Explorer
Union County is a county located in the state of Illinois. According to the 2010 census, it had a population of 17,808. Union County was created on January 2, 1818. The county seat is Jonesboro. The county is named for the federal union of the United States.
The county is named for the federal union of the United States.
County QuickFacts: CensusBureau Quick Facts
Union County was created on January 2, 1818 (Territorial Laws, 1817-1818, p. 15) and was formed from Johnson and
Jackson Counties . Present area, or parts of it, formerly included in: Johnson County (1812-1818), Randolph County
(1795-1812) and St. Clair County (1790-1795).
The County was named for the federal union of the American States. The County Seat is Jonesboro (1818-Present).
As reported by the Census Bureau, the county has a total area of 422 square miles (1,093 km2), of which, 416 square miles (1,078 km2) of it is land and 6 square miles (15 km2) of it (1.41%) is water.
Union county is located in south Illinois. Trail of Tears State
Forest and Union County State Fish and Wildlife Area are located in this
Bordering counties are as follows: