Warren County, Illinois Population 2024

16,010

Warren County, Illinois's estimated 2024 population is 16,010 with a growth rate of -1.08% in the past year according to the most recent United States census data. Warren County, Illinois is the 65th largest county in Illinois. The 2010 population was 17,710 and has seen a growth of -9.6% since that time.

Note: data after 2022 is projected based on recent change
Year
Population
Growth
Change
202915,135-175-1.14%
202815,310-175-1.13%
202715,485-175-1.12%
202615,660-175-1.11%
202515,835-175-1.09%
202416,010-175-1.08%
202316,185-175-1.07%
202216,360-225-1.36%
202116,585-236-1.4%
202016,82150.03%
201916,816-163-0.96%
201816,979-154-0.9%
201717,133-150-0.87%
201617,283-165-0.95%
201517,448-257-1.45%
201417,705450.25%
201317,660-82-0.46%
201217,742-89-0.5%
201117,8311210.68%
201017,71000%
199019,181-2,762-12.59%
198021,9433481.61%
197021,59580.04%
196021,587-394-1.79%
195021,9816953.27%
194021,286-459-2.11%
193021,7452571.2%
192021,488-1,825-7.83%
191023,3131500.65%
190023,1631,8828.84%
189021,281-1,652-7.2%
188022,933-241-1.04%
187023,1744,83826.39%
186018,33610,160124.27%
18508,1761,43721.32%
18406,7396,4312087.99%
1830308-14,827-97.96%
2024 Growth Rate
-1.08% (-175)
County Website
Warren County
County Seat
Monmouth
2020 Population
16,821
Area
542 mi²
Density
30 people/mi²
Growth Since 2020
-4.82% (-811)
Founded
1825

Population by Race

Race
Population
Percentage (of total)
White14,23184.91%
Other race9415.61%
Black or African American6383.81%
Two or more races4622.76%
Asian2481.48%
Native American1691.01%
Native Hawaiian or Pacific Islander710.42%

White

Other race

Black or African American

Two or more races

Asian

Native American

Native Hawaiian or Pacific Islander

Warren County, Illinois Population by Race

Warren County, Illinois Population Pyramid 2024

Warren County, Illinois Median Age

40.1

Total

37.9

Male

41.7

Female

Warren County, Illinois Adults

There are 13,080 adults, (3,258 of whom are seniors) in Warren County, Illinois.

Warren County, Illinois Age Dependency

70.6

Age Dependency Ratio

33.2

Old Age Dependency Ratio

37.5

Child Dependency Ratio

Warren County, Illinois Sex Ratio

Female8,44950.41%
Male8,31149.59%

Warren County, Illinois Population by Age

Warren County, Illinois Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All6,8362.376.523.5
Married3,2292.98812
Non Family2,3781.1867.332.7
Female7833.2261.638.4
Male4462.3468.631.4

2.83

Average Family Size

2.3

Average Household Size

76.5%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Warren County, Illinois Households and Families

Male

Female

Education Attained
Count
Percentage
9th to 12th Grade8477.75%
Associates Degree1,13610.39%
Bachelors Degree1,54514.13%
Graduate Degree7606.95%
High School Graduate3,78334.59%
Less Than 9th Grade5204.75%
Some College2,34521.44%

Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Warren County, Illinois Educational Attainment by Sex (over 25)

Warren County, Illinois Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

Race
Total
High School
Bachelors
White9,4248,5832,131
Hispanic84444377
Other Race56227962
Black38533046
2+ Races1541403
Asian811515
Native American60520
Islander19190

The highest rate of high school graduation is among islander people with a rate of 100%.

The highest rate of bachelors degrees is among white people with a rate of 22.61%.

Warren County, Illinois Educational Attainment by Race

All

Male

Female

Name
Average
Male
Female
Bachelors Degree$50,886$60,917$43,661
Graduate Degree$62,321$73,561$53,370
High School Graduate$38,737$52,188$24,565
Less Than 9th Grade$32,266$42,692$31,307
Overall$41,864$53,766$31,702
Some College$38,594$56,815$28,281

$41,864

Average Earnings

$53,766

Average Male

$31,702

Average Female

Warren County, Illinois Earnings by Educational Attainment

Warren County, Illinois Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Warren County, Illinois Language

88.69% of Warren County, Illinois residents speak only English, while 11.31% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.04% of the population.

Warren County, Illinois Language

Warren County, Illinois Poverty by Race

rate

Name
Total
In Poverty
Poverty Rate
White13,0521,64412.6%
Hispanic1,59264040.2%
Other90736039.69%
Multiple40813031.86%
Native16912573.96%
Black54491.65%
Asian14853.38%

14.9%

Overall Poverty Rate

14.03%

Male Poverty Rate

15.77%

Female Poverty Rate

Poverty in Warren County, Illinois

The race most likely to be in poverty in Warren County, Illinois is Native, with 73.96% below the poverty level.

The race least likely to be in poverty in Warren County, Illinois is Black, with 1.65% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.57%. Among those working part-time, it was 15.05%, and for those that did not work, the poverty rate was 21.73%.

Warren County, Illinois Poverty

rate

Rate
Poverty
Less Than 9th Grade23.31%
High School15.35%
Some College8.37%
Bachelors or Greater2.95%

Warren County, Illinois Poverty Rate by Education

rate

Rate
Poverty
Male Unemployed42.78%
Female Unemployed31.78%
Female Employed7.68%
Male Employed2.06%

Warren County, Illinois Poverty Rate by Employment Status and Sex

Warren County, Illinois Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

Name
Median
Mean
Families$78,009$90,905
Households$62,700$79,550
Married Families$91,419$-999,999,999
Non Families$40,169$53,232

mean

median

Income by Household Type

Warren County, Illinois Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

49.3%

Overall Marriage Rate

52.4%

Male Marriage Rate

46.4%

Female Marriage Rate

Warren County, Illinois Married by Age and Sex

male

female

Warren County, Illinois Marriage

The age group where males are most likely to be married is 35-44, while the female age group most likely to be married is 45-54.

Warren County, Illinois Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Warren County, Illinois Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

923

Number of Veterans

870

Male Veterans

53

Female Veterans

War
Veterans
Vietnam293
First Gulf War225
Second Gulf War151
Korea121
World War II29

Warren County, Illinois Veterans by War

count

Age Group
Veterans
75+274
65 to 74213
55 to 64178
35 to 54163
18 to 3495

Warren County, Illinois Veterans by Age

count

Name
Veterans
% of Total
White8467.42%
Black4910%
Hispanic494.5%
2+ Races2812.28%

Warren County, Illinois Veterans by Race

Warren County, Illinois Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

1.44%

Veteran Poverty Rate

34.37%

Veteran Disability Rate

Warren County, Illinois Veterans by Education

LaborForceParticipation

61.6%

Labor Force Participation

57.2%

Employment Rate

7.3%

Unemployment Rate

Warren County, Illinois Employment by Age

LaborForceParticipation

Warren County, Illinois Employment by Race

LaborForceParticipation

Warren County, Illinois Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

71.34%

Born in Warren County, Illinois

93.82%

Native Born

6.18%

Foreign Born

3.13%

Non Citizen

3.05%

Naturalized

Place of Birth

93.82% of Warren County, Illinois residents were born in the United States, with 71.34% having been born in Illinois. 3.13% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Warren County, Illinois Place of Birth

Sources