Union County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 17,808. Its county seat is Jonesboro. It is located in the southern portion of Illinois known locally as “Little Egypt”. Union County was formed out of Johnson County on January 2, 1818, the same year Illinois became a state. It was named for a joint revival meeting of the Baptists and Dunkards, called a “union meeting”. The county seal depicts the leaders of these two groups shaking hands.
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