Jefferson County, Illinois Population 2020

Jefferson County, Illinois's estimated population is 37,238 with a growth rate of -0.78% in the past year according to the most recent United States census data. Jefferson County, Illinois is the 37th largest county in Illinois.

Year Population Growth Growth Rate
202037,238-291-0.78%
201937,529-291-0.77%
201837,820-291-0.76%
201738,111-136-0.36%
201638,247-43-0.11%
201538,290-87-0.23%
201438,377-270-0.70%
201338,647-11-0.03%
201238,658-91-0.23%
201138,749-10-0.03%
201038,7591,7394.70%
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%
2020 Growth Rate
-0.78%
County Website
Founded
1819
County Seat

Jefferson County, Illinois Population Growth

Population by Race

Race Population Percentage
White33,44887.63%
Black or African American3,2018.39%
Two or More Races9332.44%
Asian4491.18%
Some Other Race940.25%
American Indian and Alaska Native440.12%

Jefferson County, Illinois Population Pyramid 2020

Jefferson County, Illinois Median Age

41


Total

40


Male

42.4


Female

Jefferson County, Illinois Adults

There are 29,723 adults, (6,974 of whom are seniors) in Jefferson County, Illinois.

Jefferson County, Illinois Age Dependency

67.8

Age Dependency Ratio

30.7

Old Age Dependency Ratio

37.1

Child Dependency Ratio

Jefferson County, Illinois Sex Ratio

Female

18,602

48.74%

Male

19,567

51.26%

Jefferson County, Illinois Households and Families

Jefferson County, Illinois Renter vs Owner Occupied by Household Type

Jefferson County, Illinois Household Types

Type Owner Renter
Married91.4%8.6%
All72.7%27.3%
Male71.8%28.2%
Non Family57.8%42.2%
Female41.6%58.4%

72.7%

Rate of Home Ownership

Type Count Average Size Owned
All15,2232.3472.7
Married7,2352.9691.4
Non Family5,4071.1557.8
Female1,7473.0841.6
Male8343.171.8

2.91

Average Family Size

2.34

Average Household Size

6.5%

Unmarried (Opposite Sex)

0.1%

Unmarried (Same Sex)

Jefferson County, Illinois Education

Education Attained Count Percentage
Less Than 9th Grade1,1544.33%
9th to 12th Grade2,5859.69%
High School Graduate8,15230.57%
Some College6,86625.75%
Associates Degree3,27112.27%
Bachelors Degree2,80510.52%
Graduate Degree1,8346.88%

Jefferson County, Illinois Educational Attainment by Race

Name Total High School Bachelors
White23,62120,6634,072
Black1,9601,431233
Hispanic52634338
Asian297254230
Multiple Races25021254
Other Race463316
Native American363412

The highest rate of high school graduation is among native american people with a rate of 94.44%.

The highest rate of bachelors degrees is among asian people with a rate of 77.44%.

Name Average Male Female
Overall$34,705$43,356$27,372
Less Than High School$18,980$24,130$14,356
High School Grad$27,141$33,269$21,274
Some College$35,560$47,979$26,393
Bachelors Degree$42,373$56,010$36,113
Graduate Degree$64,135$88,250$56,521

$34,705

Average Earnings

$43,356

Average Male

$27,372

Average Female

Jefferson County, Illinois Language

Jefferson County, Illinois Language by Age

Jefferson County, Illinois Language

95.82% of Jefferson County, Illinois residents speak only English, while 4.18% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 2.02% of the population.

Jefferson County, Illinois Poverty

Jefferson County, Illinois Poverty by Race

Name Total In Poverty Poverty Rate
White31,3035,32317.00%
Black2,27563127.74%
Multiple90634638.19%
Hispanic67831346.17%
Other831922.89%
Native36616.67%

18.36%

Overall Poverty Rate

16.35%

Male Poverty Rate

20.26%

Female Poverty Rate

Poverty in Jefferson County, Illinois

The race most likely to be in poverty in Jefferson County, Illinois is Hispanic, with 46.17% below the poverty level.

The race least likely to be in poverty in Jefferson County, Illinois is Native, with 16.67% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.12%. Among those working part-time, it was 24.19%, and for those that did not work, the poverty rate was 21.02%.

Name Poverty
Less Than High School30.43%
High School16.30%
Some College11.42%
Bachelors or Greater3.80%
Name Poverty
Female Unemployed47.76%
Male Unemployed31.09%
Female Employed12.35%
Male Employed6.69%

Jefferson County, Illinois Income

Jefferson County, Illinois Income by Household Type

Name Median Mean
Households$47,617$64,402
Families$61,271$76,950
Married Families$73,930$89,486
Non Families$27,256$38,936

Jefferson County, Illinois Marital Status

Jefferson County, Illinois Marital Status

Marriage Rates

49.5%

Overall Marriage Rate

48.6%

Male Marriage Rate

50.5%

Female Marriage Rate

Jefferson County, Illinois Married by Age and Sex

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

Jefferson County, Illinois Veterans

2,848

Number of Veterans

2,614

Male Veterans

234

Female Veterans

War Veterans
Vietnam1,121
First Gulf War592
Second Gulf War324
Korea270
World War II75
Age Group Veterans
65 to 74789
75+686
35 to 54681
55 to 64549
18 to 34143
Name Veterans % of Total
White2,69510.17%
Black933.83%
2 or More267.54%
Asian257.76%
Hispanic202.93%
Other56.67%
Indian410.26%

$Jefferson County, Illinois Veterans by Education

6.76%

Veteran Poverty Rate

40.46%

Veteran Disability Rate

Jefferson County, Illinois Employment Status

57.1%

Labor Force Participation

52.9%

Employment Rate

7.4%

Unemployment Rate

Jefferson County, Illinois Place of Birth

Origin of Non-Citizens

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

Origin of Naturalized Citizens

80.35%

Born in Illinois

98.14%

Native Born

1.86%

Foreign Born

0.73%

Non Citizen

Place of Birth

98.14% of Jefferson County, Illinois residents were born in the United States, with 80.35% having been born in Illinois. 0.73% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

  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