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Naperville, city, DuPage and Will counties, northeastern Illinois, U.S. It lies on the West Branch Du Page River, about 30 miles (50 km) west of Chicago. The oldest city in DuPage county, it was founded in 1831 by Captain Joseph Naper. Naper and his brother (John) built mills, a school, and a trading house, and in 1839 Naperville was chosen as the county seat (moved to Wheaton in 1867). The city grew as a crossroads...