Naperville is a city in DuPage and Will counties in the U.S. state of Illinois. It is a southwestern suburb of Chicago located 28 miles west of the ci…Naperville is a city in DuPage and Will counties in the U.S. state of Illinois. It is a southwestern suburb of Chicago located 28 miles west of the city on the DuPage River. As of the 2020 census, its population was 149,540, making it the state's fourth-most populous city.
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