Named after the federal union of the states, the Union County was founded in 1818. Jonesboro forms the county seat while Anna is the largest city. A population of more than 17.8K with a rich mix of White, Native American, black or African American, Asian, Hispanic or Latino, Pacific Islander, and others with over 7.2K households and 4.9K families are found here. It has an estimated area of 422 sq mi. The county is situated in the southern section frequently known as "Little Egypt" of the state of Illinois.

These days it becomes important to find various important chronological and current clues on American civil war index, birth and origin history, marriage and separation history, census index, death and obituary news directory, land and property deeds, burial and cemetery details, military war veterans’ enlistment details, immigration and naturalization minutiae, probate and court records and lots more online that are required to determine multiple issues so as to save both time and money with the aid of the Union County data archive.