Knox County, Illinois Population 2021

Knox County, Illinois's estimated population is 49,141 with a growth rate of -0.56% in the past year according to the most recent United States census data. Knox County, Illinois is the 31st largest county in Illinois. The 2010 Population was 52,912 and has seen a growth of -7.13% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
202149,141-279-0.56%
202049,420-279-0.56%
201949,699-279-0.56%
201849,978-599-1.18%
201750,577-340-0.67%
201650,917-453-0.88%
201551,370-574-1.11%
201451,944-185-0.35%
201352,129-173-0.33%
201252,302-403-0.76%
201152,705-207-0.39%
201052,912-3,481-6.17%
199056,393-5,214-8.46%
198061,6073270.53%
197061,2800.00%
196061,2806,91412.72%
195054,3662,1164.05%
194052,2509141.78%
193051,3364,6099.86%
192046,7275681.23%
191046,1592,5475.84%
190043,6124,86012.54%
189038,7524081.06%
188038,344-1,178-2.98%
187039,52210,85937.89%
186028,66315,384115.85%
185013,2796,21988.09%
18407,0606,7862476.64%
18302740.00%
2021 Growth Rate
-0.56%
County Website
Founded
1825
County Seat
2010 Population
52,912
Growth Since 2010
-7.13%
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Knox County, Illinois Population Growth

Population by Race

Race Population Percentage
White43,21985.57%
Black or African American4,4858.88%
Some Other Race1,0952.17%
Two or More Races9011.78%
Asian5541.10%
American Indian and Alaska Native2540.50%
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Knox County, Illinois Population by Race

Knox County, Illinois Population Pyramid $2021

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Knox County, Illinois Median Age

42.1


Total

40.2


Male

45.1


Female

Knox County, Illinois Adults

There are 40,517 adults, (10,528 of whom are seniors) in Knox County, Illinois.

Knox County, Illinois Age Dependency

68.4

Age Dependency Ratio

35.1

Old Age Dependency Ratio

33.3

Child Dependency Ratio

Knox County, Illinois Sex Ratio

Female

24,922

49.34%

Male

25,586

50.66%

Knox County, Illinois Population by Age

Knox County, Illinois Renter vs Owner Occupied by Household Type

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Knox County, Illinois Household Types

Type Owner Renter
Married85.7%14.3%
All66.7%33.3%
Male55.6%44.4%
Non Family54%46%
Female48.5%51.5%

66.7%

Rate of Home Ownership

Knox County, Illinois Households and Families

Type Count Average Size Owned
All20,6802.2366.7
Non Family8,8851.254
Married8,6622.9585.7
Female2,2913.1748.5
Male8423.1455.6

2.9

Average Family Size

2.23

Average Household Size

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Knox County, Illinois Households by Type

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Education Attained Count Percentage
Less Than 9th Grade9202.62%
9th to 12th Grade2,9298.33%
High School Graduate12,86536.58%
Some College8,07522.96%
Associates Degree3,72210.58%
Bachelors Degree4,38112.46%
Graduate Degree2,2806.48%
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Knox County, Illinois Educational Attainment by Sex (over 25)

Knox County, Illinois Educational Attainment by Race

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Race Total High School Bachelors
White30,83328,2296,236
Black2,4121,605152
Hispanic1,4071,026131
Other Race57438515
2+ Races31527937
Asian242210105
Native American11311362

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

The highest rate of bachelors degrees is among native american people with a rate of 54.87%.

Knox County, Illinois Educational Attainment by Race

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Name Average Male Female
Overall$32,979$41,010$27,207
Less Than 9th Grade$18,158$24,833$15,395
High School Graduate$26,088$31,882$20,769
Some College$32,278$43,085$27,146
Bachelors Degree$44,139$49,902$39,531
Graduate Degree$61,743$73,750$55,179

$32,979

Average Earnings

$41,010

Average Male

$27,207

Average Female

Knox County, Illinois Earnings by Educational Attainment

Knox County, Illinois Language by Age

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Knox County, Illinois Language

93.64% of Knox County, Illinois residents speak only English, while 6.36% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 3.72% of the population.

Knox County, Illinois Language

Knox County, Illinois Poverty by Race

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Name Total In Poverty Poverty Rate
White39,9685,71514.30%
Black3,0581,88661.67%
Hispanic2,17056125.85%
Other98738839.31%
Multiple85719322.52%
Asian3586217.32%
Native250145.60%

18.17%

Overall Poverty Rate

17.67%

Male Poverty Rate

18.66%

Female Poverty Rate

Poverty in Knox County, Illinois

The race most likely to be in poverty in Knox County, Illinois is Black, with 61.67% below the poverty level.

The race least likely to be in poverty in Knox County, Illinois is Native, with 5.60% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.61%. Among those working part-time, it was 18.15%, and for those that did not work, the poverty rate was 26.35%.

Knox County, Illinois Poverty

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Name Poverty
Less Than 9th Grade31.46%
High School19.41%
Some College9.82%
Bachelors or Greater3.84%

Knox County, Illinois Poverty Rate by Education

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Rate Poverty
Female Unemployed53.46%
Male Unemployed31.82%
Female Employed8.27%
Male Employed7.51%

Knox County, Illinois Poverty Rate by Employment Status and Sex

Knox County, Illinois Income by Household Type

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Name Median Mean
Households$44,129$58,636
Families$63,307$74,076
Married Families$75,294$86,224
Non Families$25,182$36,396
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Income by Household Type

Knox County, Illinois Marital Status

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Marriage Rates

43.4%

Overall Marriage Rate

42.4%

Male Marriage Rate

44.4%

Female Marriage Rate

Knox County, Illinois Married by Age and Sex

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Knox 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 55-64.

Knox County, Illinois Marital Status by Race

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Knox County, Illinois Marital Status

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3,288

Number of Veterans

3,162

Male Veterans

126

Female Veterans

War Veterans
Vietnam1,436
First Gulf War493
Second Gulf War308
Korea258
World War II86

Knox County, Illinois Veterans by War

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Age Group Veterans
65 to 741,239
75+888
35 to 54676
55 to 64354
18 to 34131

Knox County, Illinois Veterans by Age

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Name Veterans % of Total
White3,1538.90%
Black842.50%
Hispanic663.28%
Other Race263.56%
Asian133.00%
2+ Races122.97%

Knox County, Illinois Veterans by Race

Knox County, Illinois Veterans by Education

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4.84%

Veteran Poverty Rate

31.01%

Veteran Disability Rate

Knox County, Illinois Veterans by Education

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53.5%

Labor Force Participation

50.6%

Employment Rate

5.1%

Unemployment Rate

Knox County, Illinois Employment by Age

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Knox County, Illinois Employment by Race

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Knox 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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78.97%

Born in Knox County, Illinois

96.74%

Native Born

3.26%

Foreign Born

2.66%

Non Citizen

0.60%

Naturalized

Place of Birth

96.74% of Knox County, Illinois residents were born in the United States, with 78.97% having been born in Illinois. 2.66% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Knox 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