Aurora is a city in northeastern Illinois, United States, located along the Fox River. The population was 180,542 at the 2020 census. It is the second-most populous city in Illinois, after Chicago, and the 144th-most populous city in the US. Aurora is the most populous city in Illinois that is not a county seat.
Founded within Kane County, Aurora's city limits have expanded into DuPage, Kendall, and Will counties. From Wikipedia
