Aurora, a suburb of Chicago, is a city predominantly in Kane County, with sections in DuPage, Kendall, and Will counties. It is located in the outer region of Greater Chicago in the U.S. state of Illinois. It is the second most populous city in the state, and the 114th most populous city in the country. The population was 197,899 at the 2010 census, and was estimated to have increased to 199,963 by July 2013.