Illinois

Clinton

36,899
2020 population
1830
first census record
20
census records

About Clinton

Clinton, Illinois, first appears in the United States federal census in 1830, when it recorded a population of 2,330. At the most recent census, in 2020, its population stood at 36,899.

Its recorded population peaked at 37,762 in 2010, and has since declined by roughly 2 percent.

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

Population by decade

Census YearPopulationChart
202036,899
201037,762
200035,535
199033,944
198032,617
197028,315
196024,029
195022,594
194022,912
193021,369
192022,947
191022,832
190019,824
189017,411
188018,714
187016,285
186010,941
18505,139
18403,718
18302,330
Source

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

Historic places in Clinton

National Register of Historic Places listings in Clinton, Illinois.

General Dean Suspension Bridge
Carlyle
Twiss, James C., House
Aviston

Other counties in Illinois

Explore census history and historic records for more Illinois counties.

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Everything a full report reveals about Clinton County, Illinois

This page charts the census history of Clinton 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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Explore Illinois records

Illinoishistory ›NRHP historic sites ›Notable people from Illinois›

Frequently asked about Clinton

When does Clinton first appear in the US census?
Clinton, Illinois first appears in the federal census in 1830, with a recorded population of 2,330.
What is the population of Clinton?
At the most recent federal census (2020), Clinton had a recorded population of 36,899.
When did Clinton's population peak?
Clinton's recorded population peaked at 37,762 in 2010.
How many historic places are in Clinton?
2 sites are listed on the National Register of Historic Places in Clinton, Illinois.
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