Illinois

De Witt

15,516
2020 population
1840
first census record
19
census records

About De Witt

De Witt, Illinois, first appears in the United States federal census in 1840, when it recorded a population of 3,247. At the most recent census, in 2020, its population stood at 15,516.

Its recorded population peaked at 19,252 in 1920, and has since declined by roughly 19 percent.

On the ground today, 2 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202015,516
201016,561
200016,798
199016,516
198018,108
197016,975
196017,253
195016,894
194018,244
193018,598
192019,252
191018,906
190018,972
189017,011
188017,010
187014,768
186010,820
18505,002
18403,247
Source

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

Historic places in De Witt

National Register of Historic Places listings in De Witt, Illinois.

Magill House
Clinton
Moore, C. H., House
Clinton

Other counties in Illinois

Explore census history and historic records for more Illinois counties.

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Everything a full report reveals about De Witt County, Illinois

This page charts the census history of De Witt 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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Illinoishistory ›NRHP historic sites ›Notable people from Illinois›

Frequently asked about De Witt

When does De Witt first appear in the US census?
De Witt, Illinois first appears in the federal census in 1840, with a recorded population of 3,247.
What is the population of De Witt?
At the most recent federal census (2020), De Witt had a recorded population of 15,516.
When did De Witt's population peak?
De Witt's recorded population peaked at 19,252 in 1920.
How many historic places are in De Witt?
2 sites are listed on the National Register of Historic Places in De Witt, Illinois.
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