Jefferson County, Illinois Population 2024

36,221

Jefferson County, Illinois's estimated 2024 population is 36,221 with a growth rate of -0.27% 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 38,757 and has seen a growth of -6.54% since that time.

Note: data after 2022 is projected based on recent change
Year
Population
Growth
Change
202935,726-99-0.28%
202835,825-99-0.28%
202735,924-99-0.27%
202636,023-99-0.27%
202536,122-99-0.27%
202436,221-99-0.27%
202336,320-99-0.27%
202236,419-470-1.27%
202136,889-106-0.29%
202036,995-640-1.7%
201937,635-69-0.18%
201837,704-355-0.93%
201738,059-177-0.46%
201638,236-54-0.14%
201538,290-100-0.26%
201438,390-266-0.69%
201338,656-16-0.04%
201238,672-86-0.22%
201138,75810%
201038,75700%
199037,0204681.28%
198036,5525,10616.24%
197031,446-869-2.69%
196032,315-3,577-9.97%
195035,8921,5174.41%
194034,3753,34110.77%
193031,0342,5548.97%
192028,480-631-2.17%
191029,1119783.48%
190028,1335,54324.54%
189022,5901,9049.2%
188020,6862,82215.8%
187017,8644,89937.79%
186012,9654,85659.88%
18508,1092,34740.73%
18405,7623,207125.52%
18302,5551,864269.75%
1820691-35,035-98.07%
2024 Growth Rate
-0.27% (-99)
County Website
Jefferson County
County Seat
Mount Vernon
2020 Population
36,995
Area
571 mi²
Density
63 people/mi²
Growth Since 2020
-2.09% (-774)
Founded
1819

Population by Race

Race
Population
Percentage (of total)
White31,66985.49%
Black or African American2,4066.5%
Two or more races2,3146.25%
Asian3941.06%
Other race1660.45%
Native American880.24%
Native Hawaiian or Pacific Islander60.02%

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 2024

Jefferson County, Illinois Median Age

41.2

Total

39.5

Male

43.5

Female

Jefferson County, Illinois Adults

There are 28,774 adults, (7,255 of whom are seniors) in Jefferson County, Illinois.

Jefferson County, Illinois Age Dependency

72.1

Age Dependency Ratio

33.7

Old Age Dependency Ratio

38.4

Child Dependency Ratio

Jefferson County, Illinois Sex Ratio

Female17,94648.45%
Male19,09751.55%

Jefferson County, Illinois Population by Age

Jefferson County, Illinois Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All14,7782.397228
Married7,0852.99919
Non Family4,9711.1756.843.2
Female1,9543.1142.357.7
Male7683.0770.429.6

2.91

Average Family Size

2.39

Average Household Size

72.0%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Jefferson County, Illinois Households and Families

Male

Female

Education Attained
Count
Percentage
9th to 12th Grade1,7506.76%
Associates Degree3,47113.41%
Bachelors Degree2,99311.56%
Graduate Degree1,7026.58%
High School Graduate8,21331.73%
Less Than 9th Grade6792.62%
Some College7,07327.33%

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

Race
Total
High School
Bachelors
White22,65920,8174,262
Black1,4561,20993
2+ Races1,032873162
Hispanic56743982
Asian30422688
Other Race1058828
Native American51480
Islander660

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 28.95%.

Jefferson County, Illinois Educational Attainment by Race

All

Male

Female

Name
Average
Male
Female
Bachelors Degree$53,920$59,438$50,326
Graduate Degree$73,065$86,319$66,471
High School Graduate$37,751$44,405$26,325
Less Than 9th Grade$25,239$32,986$17,941
Overall$40,843$49,046$31,291
Some College$36,143$49,602$28,574

$40,843

Average Earnings

$49,046

Average Male

$31,291

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

96.09% of Jefferson County, Illinois residents speak only English, while 3.91% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 1.51% of the population.

Jefferson County, Illinois Language

Jefferson County, Illinois Poverty by Race

rate

Name
Total
In Poverty
Poverty Rate
White30,2203,92312.98%
Black1,82855630.42%
Multiple2,23742318.91%
Hispanic917636.87%
Other1454933.79%
Asian386133.37%
Native8555.88%

14.13%

Overall Poverty Rate

10.93%

Male Poverty Rate

17.3%

Female Poverty Rate

Poverty in Jefferson County, Illinois

The race most likely to be in poverty in Jefferson County, Illinois is Other, with 33.79% below the poverty level.

The race least likely to be in poverty in Jefferson County, Illinois is Asian, with 3.37% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.38%. Among those working part-time, it was 18.73%, and for those that did not work, the poverty rate was 19.96%.

Jefferson County, Illinois Poverty

rate

Rate
Poverty
Less Than 9th Grade19.27%
High School12.5%
Some College11.63%
Bachelors or Greater4.77%

Jefferson County, Illinois Poverty Rate by Education

rate

Rate
Poverty
Female Unemployed38.73%
Male Unemployed15.8%
Female Employed9.62%
Male Employed3.67%

Jefferson County, Illinois Poverty Rate by Employment Status and Sex

Jefferson County, Illinois Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

Name
Median
Mean
Families$72,406$87,125
Households$58,384$75,046
Married Families$87,467$102,099
Non Families$34,421$47,030

mean

median

Income by Household Type

Jefferson County, Illinois Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

50.4%

Overall Marriage Rate

49.9%

Male Marriage Rate

51.1%

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 55-64, 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

2,343

Number of Veterans

2,147

Male Veterans

196

Female Veterans

War
Veterans
Vietnam789
Second Gulf War433
First Gulf War404
Korea151
World War II14

Jefferson County, Illinois Veterans by War

count

Age Group
Veterans
65 to 74763
35 to 54555
75+438
55 to 64395
18 to 34192

Jefferson County, Illinois Veterans by Age

count

Name
Veterans
% of Total
White2,1638.61%
2+ Races826.37%
Black794.3%
Hispanic141.95%
Asian133.83%
Native American47.84%
Other Race21.64%

Jefferson County, Illinois Veterans by Race

Jefferson County, Illinois Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

4.7%

Veteran Poverty Rate

37.47%

Veteran Disability Rate

Jefferson County, Illinois Veterans by Education

LaborForceParticipation

58.7%

Labor Force Participation

54.9%

Employment Rate

6.5%

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

79.07%

Born in Jefferson County, Illinois

98.34%

Native Born

1.66%

Foreign Born

0.59%

Non Citizen

1.07%

Naturalized

Place of Birth

98.34% of Jefferson County, Illinois residents were born in the United States, with 79.07% having been born in Illinois. 0.59% 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