Back مقاطعة دوبيج (إلينوي) Arabic دوپئیج بؤلگه‌سی، ایلینوی AZB DuPage County, Illinois BAR Дупейдж (окръг, Илинойс) Bulgarian ডুপেইজ কাউন্টি, ইলিনয়স BPY Comtat de DuPage Catalan DuPage Gông (Illinois) CDO DuPage County CEB DuPage County, Illinois Welsh DuPage County German

DuPage County, Illinois

DuPage County
County
Warrenville Grove Forest Preserve on the West Branch of the DuPage River; Restored tallgrass prairie in Dunham Forest Preserve
Official seal of DuPage County
Seal
Motto: 
The Magnificent Miles West of Chicago
Map of Illinois highlighting DuPage County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 41°51′07″N 88°05′08″W / 41.85195°N 88.08567°W / 41.85195; -88.08567
Country United States
State Illinois
FoundedFebruary 9, 1839
Named forDuPage River
SeatWheaton
Largest cityAurora[a]
Area
 • Total
336 sq mi (870 km2)
 • Land327 sq mi (850 km2)
 • Water8.9 sq mi (23 km2)  2.6%
Population
 (2020)
 • Total
932,877 Increase
 • Density2,800/sq mi (1,100/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Area code630 and 331
Congressional districts3rd, 4th, 6th, 8th, 11th
Websitewww.dupagecounty.gov
[1]

DuPage County (/duːˈpeɪdʒ/ doo-PAYJ) is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area. As of the 2020 census, the population was 932,877, making it Illinois' second-most populous county. Its county seat is Wheaton.[2]

Known for its vast tallgrass prairies,[3] DuPage County has become mostly developed and suburbanized, although some pockets of farmland remain in the county's western and northern parts.[4] Located in the Rust Belt, the area is one of few in the region whose economy quickly became dependent on the headquarters of several large corporations due to its close proximity to Chicago. As quarries closed in the 1990s, land that was formerly used for mining and plants was converted into mixed-use, master-planned developments to meet the growing tax base.[5] The county has a mixed socioeconomic profile and residents of Hinsdale, Naperville and Oak Brook include some of the wealthiest people in the Midwest. On the whole, the county enjoys above average median household income levels and low overall poverty levels when compared to the national average.[6]


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  1. ^ "DuPage County". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  3. ^ Robertson, Ken. "Tallgrass Prairie: Where to see prairies". Illinois Natural History Survey. Retrieved October 24, 2023.
  4. ^ Kuethe, T. (April 26, 2019). "Changes in Farms and Farmland in Illinois". farmdoc daily. 9 (76). Department of Agricultural and Consumer Economics, University of Illinois at Urbana-Champaign.
  5. ^ "Cantera Development". City of Warrenville, Illinois. Retrieved October 24, 2023.
  6. ^ "DuPage County, IL". Data USA. Retrieved October 22, 2018.

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