Jefferson County, Illinois Population 2023

36,600

Jefferson County, Illinois's estimated 2023 population is 36,600 with a growth rate of -0.47% in the past year according to the most recent United States census data. Jefferson County, Illinois is the 38th largest county in Illinois. The 2010 population was 38,827 and has seen a growth of -5.74% since that time.

Note: data after 2021 is projected based on recent change

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2023 Growth Rate
-0.47% (-171)
County Website
Jefferson County
Founded
1819
County Seat
Mount Vernon
2010 Population
38,827
Growth Since 2010
-5.74% (-2,227)

Jefferson County, Illinois Population 2023

Population by Race

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White

Black or African American

Two or more races

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

Jefferson County, Illinois Population by Race

Jefferson County, Illinois Population Pyramid 2023

Jefferson County, Illinois Median Age

41.2

Total

39.6

Male

43.4

Female

Jefferson County, Illinois Adults

There are 28,975 adults, (7,106 of whom are seniors) in Jefferson County, Illinois.

Jefferson County, Illinois Age Dependency

70.8

Age Dependency Ratio

32.5

Old Age Dependency Ratio

38.4

Child Dependency Ratio

Jefferson County, Illinois Sex Ratio

Female17,95348.05%
Male19,40951.95%

Jefferson County, Illinois Population by Age

Jefferson County, Illinois Renter vs Owner Occupied by Household Type

2.92

Average Family Size

2.42

Average Household Size

71.6%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Jefferson County, Illinois Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

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

Jefferson County, Illinois Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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

The highest rate of bachelors degrees is among asian people with a rate of 35.47%.

Jefferson County, Illinois Educational Attainment by Race

All

Male

Female

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$38,434

Average Earnings

$47,696

Average Male

$28,755

Average Female

Jefferson County, Illinois Earnings by Educational Attainment

Jefferson County, Illinois Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Jefferson County, Illinois Language

96.74% of Jefferson County, Illinois residents speak only English, while 3.26% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 1.23% of the population.

Jefferson County, Illinois Language

Jefferson County, Illinois Poverty by Race

rate

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15.09%

Overall Poverty Rate

11.98%

Male Poverty Rate

18.19%

Female Poverty Rate

Poverty in Jefferson County, Illinois

The race most likely to be in poverty in Jefferson County, Illinois is Black, with 32.51% below the poverty level.

The race least likely to be in poverty in Jefferson County, Illinois is Asian, with 2.51% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.58%. Among those working part-time, it was 19.14%, and for those that did not work, the poverty rate was 19.94%.

Jefferson County, Illinois Poverty

rate

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Jefferson County, Illinois Poverty Rate by Education

rate

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Jefferson County, Illinois Poverty Rate by Employment Status and Sex

Jefferson County, Illinois Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Jefferson County, Illinois Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

49.3%

Overall Marriage Rate

48.3%

Male Marriage Rate

50.4%

Female Marriage Rate

Jefferson County, Illinois Married by Age and Sex

male

female

Jefferson County, Illinois Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

Jefferson County, Illinois Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Jefferson County, Illinois Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

2,471

Number of Veterans

2,263

Male Veterans

208

Female Veterans

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Jefferson County, Illinois Veterans by War

count

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Jefferson County, Illinois Veterans by Age

count

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Jefferson County, Illinois Veterans by Race

Jefferson County, Illinois Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

4.87%

Veteran Poverty Rate

39.15%

Veteran Disability Rate

Jefferson County, Illinois Veterans by Education

LaborForceParticipation

57.9%

Labor Force Participation

53.9%

Employment Rate

6.8%

Unemployment Rate

Jefferson County, Illinois Employment by Age

LaborForceParticipation

Jefferson County, Illinois Employment by Race

LaborForceParticipation

Jefferson 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

80.94%

Born in Jefferson County, Illinois

99.26%

Native Born

1.87%

Foreign Born

0.74%

Non Citizen

1.13%

Naturalized

Place of Birth

99.26% of Jefferson County, Illinois residents were born in the United States, with 80.94% having been born in Illinois. 0.74% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Jefferson County, Illinois Place of Birth

Sources