What is the population of Cass County?

The population of Cass County, IL is 11,925.

Where is Cass County located?

Cass County, IL is located at latitude 39.9735600 and longitude -90.2473800. It is in United States.

What is the area of Cass County?

The area of Cass County, IL is 994 km².

What is the elevation of Cass County?

Cass County, IL has an elevation of 193 meters (633 feet) above sea level.

What time zone is Cass County in?

Cass County, IL is in the America/Chicago time zone.

How has the population of Cass County changed?

The population of Cass County, IL has decreased from 13,642 (2010) to 11,925 (2020), a change of -12.6%.

Cass County, Illinois

Cass County: county in Illinois, United States.

About

Cass County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 13,642 and a population density of 14 people per km². After 10 years in 2020 county had an estimated population of 11,925 inhabitants. Its county seat is Virginia. The county was created 189 years ago in 1836.

Cass County locator map — Location of Cass County on Illinois map.

County Snapshot

Cass County at a glance

Cass County currently has 2 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.

Browse county places

Mapped populated places

These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.

Illinois counties

102

Open related pages

Largest city

Beardstown

Population 5,335

Quick Facts about Cass County

Population	11,925 (2020)
Country	United States of America
State	Illinois (United States)
Different from	Cass County, Cass County, Cass County, Cass County, Cass County, Cass County, Cass County, Cass County
Area	994 km²
Water as percent of area	2.1%
Land as percent of area	97.9%
Latitude & Longitude	39.9736,-90.2474
Named for	Lewis Cass
Capital	Virginia
Establishment	January 01, 1837
Time Zone	America/Chicago
Local time	09:10:19 (23rd September 2026)
Density	12 Pop. per km² as of 2020
Population growth	-12.59% (2010-2020)
Weather	72℉ Partly Sunny 7-days weather

Cass County Courthouse Virginia image

Geography

Cass County is located at 39°58'25"N 90°14'51"W (39.9735600, -90.2473800). It has 5 neighbors: Brown County, Morgan County, Sangamon County, Mason County and Schuyler County.

Cass County map

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The largest city of Cass County is Beardstown with a population of 5,335. Other cities include and Virginia population 1,406. See all Cass County cities & populated places.

Cass County Populated Places

Cities, towns, neighborhoods & other populated places in Cass County.

City Name	Population	Title
Beardstown	5,335	City in Illinois
Virginia	1,406	City in Illinois, USA

Weather

72°F

Partly Sunny

6 to 10 mph NNE Wednesday

Partly sunny, with a high near 72. North northeast wind 6 to 10 mph.

7-Day Forecast

Official website of Cass County

Official Website

Cass County has 5 neighbours.

Brown County county in Illinois, United States.
Morgan County county in Illinois, United States.
Sangamon County county in Illinois, United States.
Mason County county in Illinois, United States.
Schuyler County county in Illinois, United States.

Demographics

According to census records, the population of Cass County decreased by 12.59% in 10 years.

Year	Population	% Change	Method
2010	13,642	-	census
2011	13,629	-0.1%	estimation process
2012	13,427	-1.48%	estimation process
2013	13,293	-1%	estimation process
2014	13,081	-1.59%	estimation process
2015	12,843	-1.82%	estimation process
2016	12,672	-1.33%	estimation process
2017	12,492	-1.42%	estimation process
2018	12,312	-1.44%	estimation process
2019	12,147	-1.34%	estimation process
2020	11,925	-1.83%	estimation process

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People born in Cass County (3)

People born in Cass County, including writer and naturalist Roy Bedichek, jurist Isham Reavis, judge John Campbell Rice, .

More notable people

Other places with the same name (8)

Cass County, North Dakota county in Minnesota, United States. with a population of 183,904 people.
Cass County, Missouri county in Missouri, United States. with a population of 106,806 people.
Cass County, Michigan county in Michigan, United States. with a population of 51,584 people.
Cass County, Indiana county in Indiana, United States. with a population of 37,388 people.
Cass County, Minnesota county in Minnesota, United States. with a population of 29,928 people.
Cass County, Texas county in Texas, United States. with a population of 29,879 people.
Cass County, Nebraska county in Nebraska, United States. with a population of 26,232 people.
Cass County, Iowa county in Iowa, United States. with a population of 12,817 people.

Illinois Other Counties (more counties)

County Name	Population	Title
Cook County	5,108,284	County in Illinois, United States
Chicago	2,677,643	The third most populous city in the United States and the center of the Chicago metropolitan area.
DuPage County	917,481	County in Illinois, United States
Lake County	693,593	County in Oregon, United States
Will County	688,726	County in Illinois, United States
Kane County	531,010	County in southern Utah, United States
McHenry County	305,888	County in Illinois, United States
Winnebago County	281,295	County in Illinois, United States
Madison County	262,635	County in Montana, United States
Saint Clair County	258,046	The County of St.
Champaign County	209,192	County in Illinois, United States
Aurora	196,383	The second most populous city in Illinois.
Sangamon County	193,882	County in Illinois, United States
Peoria County	177,652	County in Illinois, United States of America
McLean County	171,256	County in North Dakota, United States
Naperville	147,986	The second most populous city in Illinois.