Illinois

Cass

13,042
2020 population
1840
first census record
19
census records

About Cass

Cass, Illinois, first appears in the United States federal census in 1840, when it recorded a population of 2,981. At the most recent census, in 2020, its population stood at 13,042.

Its recorded population peaked at 17,896 in 1920, and has since declined by roughly 27 percent.

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

Population by decade

Census YearPopulationChart
202013,042
201013,642
200013,695
199013,437
198015,084
197014,219
196014,539
195015,097
194016,425
193016,537
192017,896
191017,372
190017,222
189015,963
188014,493
187011,580
186011,325
18507,253
18402,981
Source

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

Historic places in Cass

National Register of Historic Places listings in Cass, Illinois.

Cunningham, Andrew, Farm
Virginia
Beardstown Grand Opera House
Beardstown

Other counties in Illinois

Explore census history and historic records for more Illinois counties.

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Everything a full report reveals about Cass County, Illinois

This page charts the census history of Cass 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 Cass

When does Cass first appear in the US census?
Cass, Illinois first appears in the federal census in 1840, with a recorded population of 2,981.
What is the population of Cass?
At the most recent federal census (2020), Cass had a recorded population of 13,042.
When did Cass's population peak?
Cass's recorded population peaked at 17,896 in 1920.
How many historic places are in Cass?
2 sites are listed on the National Register of Historic Places in Cass, Illinois.
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