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 s…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 the county seat of any county that it resides in.
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