Welcome to INFO AURORA – the new go-to app for the City of Aurora! Located 35 miles west of Chicago, Aurora is the second largest city in Illinois with a population of 200,456. Aurora is known as the "City of Lights" because it was one of the first in the nation to illuminate its streets with electric lights. Situated along the Fox River, Aurora extends 46 square miles encompassing Kane, DuPage, Kendall and Will counties.