Dupage County is a county located in the U.S. state of Illinois. As of the most recent data available, the county has a population of approximately 904,161 people, with a population density of about 707.07 persons per square mile.
The county spans a total land area of 334.00 square miles (865.00 square kilometers). The administrative center and county seat is Wheaton, which often serves as a hub for local governance and services. The largest city within the county by population is Naperville.
Geographically, Dupage County experiences varied elevations, with its highest point at Hanover Park 810 ft and its lowest point at Darien 0 ft. The region operates in the UTC-6.