Yorkville is a city in Kendall county, Illinois, United States. The population was 6,189 at the 2000 United States Census and had grown to 19,388 as of the 2017 census. It is the county seat of Kendall County. Yorkville is in the center of Kendall County, the fastest-growing county in Illinois and according to recent statistics released in June 2010, by CNN, is the fastest-growing county in the United States.
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