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Kaskaskia is a village in Randolph County, Illinois, on the west side of the Mississippi River. The population of Kaskaskia was 21 in the 2020 United States census, making it the third-least populous incorporated community in Illinois behind Valley City and Florence. Kaskaskia has an Illinois telephone area code (618) and a Missouri ZIP Code (63673). Its roads are maintained by Illinois Department of Transportation, and its few residents vote in Illinois elections. The town was evacuated in the Great Flood of 1993, which covered it with water more than 9 ft (3 m) deep.