United States › Illinois › Warren County COUNTY
Warren County Illinois · 16,222 residents (2025 est.) · 542 sq mi
Time machine
COMPARE TO 1990 Census 2000 Census 2009 ACS 2010 ACS 2011 ACS 2012 ACS 2013 ACS 2014 ACS 2015 ACS 2016 ACS 2017 ACS 2018 ACS 2019 ACS 2020 ACS 2021 ACS 2022 ACS 2023 ACS
The short version
Warren County is a county of 16,447 people in Illinois. Home values have risen by half since 2000, reaching $105,000. 22% of adults hold a bachelor's degree, below the 36% national rate. Owners hold 75% of the housing stock. Density works out to 30 people per square mile. Renters pay $788 a month at the median.
At a glance
Lower income
below the US median
US median: $82,259
Mid-age
median age 38.5
US median: 38.9
Less educated
22% hold a bachelor's degree
US average: 36%
Stable housing
home values roughly flat, inflation adjusted
US median home: $376,019
Section 01
Population & growth from 18,735 in 2000
16,222 in 2025 (Census Bureau estimate)
from 32 / sq mi in 2009
US average: 281
from 37.8 in 2000
US average: 38.9
Population, 1990 – 2024
16K 17K 18K 19K 19K 1990 2000 2010 2020 2024 Warren County Age distribution, 2024
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $67,385
+2%inflation adjusted, since 2000
from $36,224 in 2000
US average: $82,259
from $16,946 in 2000
US average: $44,673
Households earning $100K+
from 19.1% in 2009
US average: 53.3%
from 9.2% in 2000
US average: 12.5%
from 0.400 in 2010
US average: 0.476
Workforce by industry, 2024
Professional, scientific, technical 7.7%
Agriculture, forestry, fishing 4%
Public administration 3.9%
Transportation & warehousing 3.8%
Arts, entertainment, food 1.2%
Education & health services 0.5%
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$105,000
−4%inflation adjusted, since 2000
from $60,000 in 2000
US average: $376,019
$788
+15%inflation adjusted, since 2000
from $376 in 2000
US average: $1,442
from 74.6% in 2000
24.8% rent
from 11.1% in 2009
US average: 10.0%
from 2.30 people in 2009
US average: 2.54
from 20.9% in 2009
US average: 22.9%
from 44.0% in 2009
US average: 47.4%
from 2.1 in 2009
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
Section 04
Race & ethnicity 2000
White, non-Hispanic 94.3%(17,672)
Hispanic / Latino 2.7%(507)
2024
White, non-Hispanic 81.1%(13,342)
Hispanic / Latino 11.1%(1,820)
from 22 in 2009
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
from 42 in 2020
Our index, 0 to 100. Higher means White and non-White residents are more separated across neighborhoods.
Section 04 · Origins
Detailed origins & ancestry Ancestry
+ 21 more ancestry groups with data from 15.8% in 2000
US average: 35.6%
High school or higher
from 82.3% in 2000
US average: 89.6%
from 4.7% in 2000
US average: 14.0%
Section 06
Commute & transportation from 13.7 min in 2000
US average: 26.5
from 76.4% in 2009
US average: 68.9%
from 10.0% in 2009
US average: 8.5%
from 0.3% in 2009
US average: 3.2%
from 5.0% in 2009
US average: 15.0%
from 6.8% in 2009
US average: 2.4%
from 0.5% in 2009
US average: 0.4%
from 5.6% in 2009
US average: 8.3%
Section 07
Work & employment from 7.8% in 2011
US average: 5.2%
from 62.4% in 2011
US average: 63.5%
Women 20-64 in the labor force
from 78.0% in 2020
US average: 74.6%
from 12.9% in 2009
US average: 13.1%
from 27.3% in 2009
US average: 42.5%
Section 08
People & community from 2.6% in 2009
US average: 14.1%
from 11.4% in 2009
US average: 6.2%
from 13.1% in 2012
US average: 13.3%
from 12.1% in 2013
US average: 8.4%
from 71.4% in 2017
US average: 91.0%
Computer in household
from 90.5% in 2020
US average: 95.5%
from 84.0% in 2020
US average: 87.7%
from 90.3% in 2016
US average: 77.7%
from 7.3% in 2016
US average: 13.6%
Marital status
Men 15+
Never married 36.8%(2,465)
Women 15+
Never married 31.5%(2,132)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage from 12.1% in 2013
US average: 8.4%
from 53.8% in 2020
US average: 54.8%
Direct-purchase
from 15.1% in 2020
US average: 13.8%
from 20.1% in 2020
US average: 18.4%
from 22.6% in 2020
US average: 20.9%
VA health care
from 1.9% in 2020
US average: 2.2%
Any private
from 67.4% in 2020
US average: 67.1%
Any public
from 40.9% in 2020
US average: 36.7%
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans Veterans by period of service, 2024
Gulf War (2001 or later) 22.4%(210)
Gulf War (1990s) 22.9%(215)
Share of the 937 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
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Drill deeper
Places similar to Warren County Head to head
Compare Warren County to nearby counties WARREN COUNTY VS
Henderson County
Income $62,227 −8%
Home value $104,400 −1%
Population 5,984 −63%
SEE FULL COMPARISON →
WARREN COUNTY VS
Knox County
Income $57,030 −15%
Home value $111,900 +7%
Population 47,767 +194%
SEE FULL COMPARISON →
WARREN COUNTY VS
Mercer County
Income $74,182 +10%
Home value $146,700 +40%
Population 15,229 −6%
SEE FULL COMPARISON →
WARREN COUNTY VS
McDonough County
Income $52,795 −22%
Home value $107,500 +2%
Population 25,916 +60%
SEE FULL COMPARISON →
Frequently asked
How many people live in Warren County, Illinois? Warren County, Illinois has about 16,447 residents according to the 2024 American Community Survey.
What is the median household income in Warren County, Illinois? The typical household in Warren County, Illinois earns about $67,385 a year. Half of households make more than that, and half make less.
Is Warren County, Illinois expensive? In Warren County, Illinois, the median home is worth about $105,000, and the typical rent is about $788 a month.
How educated are people in Warren County, Illinois? About 22.0% of adults age 25 and over in Warren County, Illinois hold a bachelor's degree or higher.
What is the poverty rate in Warren County, Illinois? About 14.6% of people in Warren County, Illinois live below the federal poverty line.
Has Warren County, Illinois grown since 1990? Yes, Warren County, Illinois has shrunk since 1990. The population has lost about 2,734 residents, a change of about -14 percent over that period.
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