Jefferson County, Illinois Population 2021

Jefferson County, Illinois's estimated population is 37,636 with a growth rate of -0.06% in the past year according to the most recent United States census data. Jefferson County, Illinois is the 37th largest county in Illinois. The 2010 Population was 38,755 and has seen a growth of -2.89% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
202137,636-24-0.06%
202037,660-24-0.06%
201937,684-24-0.06%
201837,708-337-0.89%
201738,045-169-0.44%
201638,214-58-0.15%
201538,272-102-0.27%
201438,374-267-0.69%
201338,641-17-0.04%
201238,658-91-0.23%
201138,749-6-0.02%
201038,7551,7354.69%
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%
189022,5901,9049.20%
188020,6862,82215.80%
187017,8644,89937.79%
186012,9654,85659.88%
18508,1092,34740.73%
18405,7623,207125.52%
18302,5551,864269.75%
18206910.00%
2021 Growth Rate
-0.06%
County Website
Founded
1819
County Seat
2010 Population
38,755
Growth Since 2010
-2.89%
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Jefferson County, Illinois Population Growth

Population by Race

Race Population Percentage
White33,16287.30%
Black or African American3,1778.36%
Two or More Races1,0372.73%
Asian4381.15%
Some Other Race930.24%
American Indian and Alaska Native730.19%
Native Hawaiian and Other Pacific Islander50.01%
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Jefferson County, Illinois Population by Race

Jefferson County, Illinois Population Pyramid $2021

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Jefferson County, Illinois Median Age

40.9


Total

40


Male

42.1


Female

Jefferson County, Illinois Adults

There are 29,543 adults, (7,074 of whom are seniors) in Jefferson County, Illinois.

Jefferson County, Illinois Age Dependency

69.1

Age Dependency Ratio

31.5

Old Age Dependency Ratio

37.6

Child Dependency Ratio

Jefferson County, Illinois Sex Ratio

Female

18,485

48.66%

Male

19,500

51.34%

Jefferson County, Illinois Population by Age

Jefferson County, Illinois Renter vs Owner Occupied by Household Type

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Jefferson County, Illinois Household Types

Type Owner Renter
Married91.9%8.1%
All73.2%26.8%
Male70.2%29.8%
Non Family59.7%40.3%
Female39.8%60.2%

73.2%

Rate of Home Ownership

Jefferson County, Illinois Households and Families

Type Count Average Size Owned
All14,9852.3773.2
Married7,1432.9891.9
Non Family5,1751.1659.7
Female1,8123.1239.8
Male8553.170.2

2.93

Average Family Size

2.37

Average Household Size

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Jefferson County, Illinois Households by Type

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Education Attained Count Percentage
Less Than 9th Grade9803.70%
9th to 12th Grade2,3488.87%
High School Graduate8,10130.60%
Some College6,92926.17%
Associates Degree3,36412.71%
Bachelors Degree2,90910.99%
Graduate Degree1,8416.95%
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Jefferson County, Illinois Educational Attainment by Sex (over 25)

Jefferson County, Illinois Educational Attainment by Race

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Race Total High School Bachelors
White23,50820,8854,248
Black1,9021,427174
Hispanic49334246
Asian298255216
2+ Races25520654
Other Race46386
Native American424012
Islander55

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 72.48%.

Jefferson County, Illinois Educational Attainment by Race

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Name Average Male Female
Overall$34,850$43,604$26,695
Less Than 9th Grade$19,455$27,228$13,977
High School Graduate$28,834$34,457$21,918
Some College$33,632$48,712$25,635
Bachelors Degree$43,372$52,875$37,358
Graduate Degree$67,010$90,192$57,353

$34,850

Average Earnings

$43,604

Average Male

$26,695

Average Female

Jefferson County, Illinois Earnings by Educational Attainment

Jefferson County, Illinois Language by Age

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Jefferson County, Illinois Language

95.51% of Jefferson County, Illinois residents speak only English, while 4.49% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 2.08% of the population.

Jefferson County, Illinois Language

Jefferson County, Illinois Poverty by Race

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Name Total In Poverty Poverty Rate
White31,1824,85815.58%
Black2,34068929.44%
Multiple1,01540339.70%
Hispanic71028640.28%
Other932526.88%
Native6457.81%

17.03%

Overall Poverty Rate

14.29%

Male Poverty Rate

19.63%

Female Poverty Rate

Poverty in Jefferson County, Illinois

The race most likely to be in poverty in Jefferson County, Illinois is Hispanic, with 40.28% below the poverty level.

The race least likely to be in poverty in Jefferson County, Illinois is Native, with 7.81% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.85%. Among those working part-time, it was 23.40%, and for those that did not work, the poverty rate was 18.01%.

Jefferson County, Illinois Poverty

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Name Poverty
Less Than 9th Grade26.87%
High School13.84%
Some College10.67%
Bachelors or Greater4.23%

Jefferson County, Illinois Poverty Rate by Education

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Rate Poverty
Female Unemployed41.02%
Male Unemployed22.85%
Female Employed11.91%
Male Employed5.21%

Jefferson County, Illinois Poverty Rate by Employment Status and Sex

Jefferson County, Illinois Income by Household Type

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Name Median Mean
Households$49,896$66,359
Families$62,066$78,049
Married Families$75,318$91,580
Non Families$28,324$41,258
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Income by Household Type

Jefferson County, Illinois Marital Status

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Marriage Rates

49.6%

Overall Marriage Rate

48.4%

Male Marriage Rate

50.8%

Female Marriage Rate

Jefferson County, Illinois Married by Age and Sex

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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

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Jefferson County, Illinois Marital Status

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2,735

Number of Veterans

2,464

Male Veterans

271

Female Veterans

War Veterans
Vietnam975
First Gulf War559
Second Gulf War359
Korea256
World War II81

Jefferson County, Illinois Veterans by War

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Age Group Veterans
65 to 74763
35 to 54681
75+660
55 to 64468
18 to 34163

Jefferson County, Illinois Veterans by Age

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Name Veterans % of Total
White2,5679.76%
Black1154.72%
2+ Races277.30%
Asian226.98%
Hispanic121.71%
Native American48.89%

Jefferson County, Illinois Veterans by Race

Jefferson County, Illinois Veterans by Education

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4.23%

Veteran Poverty Rate

39.37%

Veteran Disability Rate

Jefferson County, Illinois Veterans by Education

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57%

Labor Force Participation

52.9%

Employment Rate

7.2%

Unemployment Rate

Jefferson County, Illinois Employment by Age

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Jefferson County, Illinois Employment by Race

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Jefferson County, Illinois Employment by Education

Origin of Non-Citizens

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

Origin of Naturalized Citizens

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79.46%

Born in Jefferson County, Illinois

98.03%

Native Born

1.97%

Foreign Born

0.82%

Non Citizen

1.15%

Naturalized

Place of Birth

98.03% of Jefferson County, Illinois residents were born in the United States, with 79.46% having been born in Illinois. 0.82% 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

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources