Aurora is a city in DuPage, Kane, Kendall, and Will counties in the U.S. state of Illinois. Located primarily in DuPage and Kane counties, the second most populous city in the state, and the 124th most populous city in the country. The population was 197,899 at the 2010 census, and was estimated to have decreased to 197,757 by 2019.Founded within Kane County, Aurora's city limits and population have expanded into DuPage, Will, and Kendall counties.... Show more

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