|Union County Illinois Cities/Towns -
Alto Pass, Anna, Balcom, Cobden, Dongola, Jonesboro (County Seat),Lick Creek, Mill Creek, Saratoga, Wolf Lake
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Union County is a county located in the U.S. state of Illinois. As of the 2000 census, the population was 18,293. Its county seat is Jonesboro.
Union County was formed in 1818, the same year Illinois joined the Union.