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Aurora, a suburb of Chicago, is a city in DuPage, Kane, Kendall, and Will counties in the U.S. state of Illinois. Located primarily in DuPage and Kane counties, it is an outer suburb of Chicago and the second most populous city in the state, and the 115th most populous city in the country. The population was 197,899 at the 2010 census, and was estimated to have increased to 199,602 by 2018.