Illinois

DuPage

932,877
2020 population
1840
first census record
19
census records

About DuPage

DuPage, Illinois, first appears in the United States federal census in 1840, when it recorded a population of 3,535. At the most recent census, in 2020, its population stood at 932,877.

The county's recorded population has risen across the decades to its highest level in 2020.

Population by decade

Census YearPopulationChart
2020932,877
2010916,924
2000904,161
1990781,666
1980658,835
1970491,882
1960313,459
1950154,599
1940103,480
193091,998
192042,120
191033,432
190028,196
189022,551
188019,161
187016,685
186014,701
18509,290
18403,535
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

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Everything a full report reveals about DuPage County, Illinois

This page charts the census history of DuPage County, Illinois. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
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Frequently asked about DuPage

When does DuPage first appear in the US census?
DuPage, Illinois first appears in the federal census in 1840, with a recorded population of 3,535.
What is the population of DuPage?
At the most recent federal census (2020), DuPage had a recorded population of 932,877.
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