Aurora is the second most populous city in the U.S. state of Illinois, and the 112th largest city in the United States. A suburb of Chicago, located 40 miles west of the Loop, its population in 2010 was 197,899.Originally founded within Kane County, Aurora's city limits have expanded greatly over the past 50 years and now spill over into DuPage, Will and Kendall Counties. In 2010, Kendall was cited as the fastest growing county in the United States.
In 1908, Aurora officially adopted the nickname "City of Lights", because it was one of the first cities in the United States to implement an all-electric street lighting system in 1881. Aurora's downtown is located on the Fox River.