Williamson County, Illinois Population 2021

Williamson County, Illinois's estimated population is 65,827 with a growth rate of -0.58% in the past year according to the most recent United States census data. Williamson County, Illinois is the 23rd largest county in Illinois. The 2010 Population was 66,432 and has seen a growth of -0.91% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
202165,827-385-0.58%
202066,212-385-0.58%
201966,597-385-0.57%
201866,982-67-0.10%
201767,049-405-0.60%
201667,454260.04%
201567,428160.02%
201467,412-38-0.06%
201367,4506741.01%
201266,776440.07%
201166,7323000.45%
201066,4328,69915.07%
199057,7331,1952.11%
198056,5387,51715.33%
197049,0212,9046.30%
196046,117-2,504-5.15%
195048,621-2,803-5.45%
194051,424-2,456-4.56%
193053,880-7,212-11.81%
192061,09215,99435.46%
191045,09817,30262.25%
190027,7965,57025.06%
189022,2262,90215.02%
188019,3241,99511.51%
187017,3295,12441.98%
186012,2054,98969.14%
18507,2162,75961.90%
18404,4570.00%
2021 Growth Rate
-0.58%
County Website
Founded
1839
County Seat
2010 Population
66,432
Growth Since 2010
-0.91%
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Williamson County, Illinois Population Growth

Population by Race

Race Population Percentage
White60,88190.73%
Black or African American2,8744.28%
Two or More Races1,7212.56%
Asian7851.17%
Some Other Race6660.99%
American Indian and Alaska Native1540.23%
Native Hawaiian and Other Pacific Islander210.03%
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Williamson County, Illinois Population by Race

Williamson County, Illinois Population Pyramid $2021

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Williamson County, Illinois Median Age

41.2


Total

40.3


Male

42.3


Female

Williamson County, Illinois Adults

There are 52,420 adults, (12,505 of whom are seniors) in Williamson County, Illinois.

Williamson County, Illinois Age Dependency

68.1

Age Dependency Ratio

31.3

Old Age Dependency Ratio

36.8

Child Dependency Ratio

Williamson County, Illinois Sex Ratio

Female

33,628

50.11%

Male

33,474

49.89%

Williamson County, Illinois Population by Age

Williamson County, Illinois Renter vs Owner Occupied by Household Type

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Williamson County, Illinois Household Types

Type Owner Renter
Married87.7%12.3%
All70.1%29.9%
Male60.3%39.7%
Female54.9%45.1%
Non Family54.4%45.6%

70.1%

Rate of Home Ownership

Williamson County, Illinois Households and Families

Type Count Average Size Owned
All27,0292.4170.1
Married12,4642.9887.7
Non Family10,0761.2354.4
Female3,0983.454.9
Male1,3913.660.3

3.01

Average Family Size

2.41

Average Household Size

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Williamson County, Illinois Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1,2662.66%
9th to 12th Grade2,3965.04%
High School Graduate14,78731.07%
Some College12,48026.23%
Associates Degree5,08110.68%
Bachelors Degree6,96614.64%
Graduate Degree4,6099.69%
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Williamson County, Illinois Educational Attainment by Sex (over 25)

Williamson County, Illinois Educational Attainment by Race

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Race Total High School Bachelors
White43,67640,55010,732
Black1,9221,812414
Hispanic943749211
2+ Races576532116
Asian552396177
Other Race42930175
Native American1509228
Islander2121

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 32.07%.

Williamson County, Illinois Educational Attainment by Race

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Name Average Male Female
Overall$35,764$43,700$30,439
Less Than 9th Grade$17,303$19,402$15,792
High School Graduate$26,856$31,372$23,925
Some College$34,643$44,247$26,306
Bachelors Degree$47,781$54,724$38,731
Graduate Degree$66,500$79,667$57,418

$35,764

Average Earnings

$43,700

Average Male

$30,439

Average Female

Williamson County, Illinois Earnings by Educational Attainment

Williamson County, Illinois Language by Age

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Williamson County, Illinois Language

96.44% of Williamson County, Illinois residents speak only English, while 3.56% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.01% of the population.

Williamson County, Illinois Language

Williamson County, Illinois Poverty by Race

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Name Total In Poverty Poverty Rate
White58,6137,19612.28%
Black2,37578332.97%
Multiple1,63360937.29%
Hispanic1,58132620.62%
Asian74410514.11%
Islander2121100.00%
Other597111.84%
Native9033.33%

13.86%

Overall Poverty Rate

12.88%

Male Poverty Rate

14.79%

Female Poverty Rate

Poverty in Williamson County, Illinois

The race most likely to be in poverty in Williamson County, Illinois is Islander, with 100.00% below the poverty level.

The race least likely to be in poverty in Williamson County, Illinois is Other, with 1.84% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.37%. Among those working part-time, it was 17.45%, and for those that did not work, the poverty rate was 19.31%.

Williamson County, Illinois Poverty

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Name Poverty
Less Than 9th Grade29.02%
High School13.58%
Some College10.29%
Bachelors or Greater3.65%

Williamson County, Illinois Poverty Rate by Education

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Rate Poverty
Male Unemployed41.52%
Female Unemployed34.57%
Female Employed7.82%
Male Employed5.64%

Williamson County, Illinois Poverty Rate by Employment Status and Sex

Williamson County, Illinois Income by Household Type

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Name Median Mean
Households$50,734$67,912
Families$66,949$83,273
Married Families$80,250$96,354
Non Families$27,949$39,468
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Income by Household Type

Williamson County, Illinois Marital Status

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Marriage Rates

48.4%

Overall Marriage Rate

48.6%

Male Marriage Rate

48.1%

Female Marriage Rate

Williamson County, Illinois Married by Age and Sex

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Williamson 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.

Williamson County, Illinois Marital Status by Race

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Williamson County, Illinois Marital Status

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5,298

Number of Veterans

4,890

Male Veterans

408

Female Veterans

War Veterans
Vietnam2,272
First Gulf War1,085
Second Gulf War690
Korea273
World War II84

Williamson County, Illinois Veterans by War

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Age Group Veterans
65 to 741,809
35 to 541,206
75+1,046
55 to 64898
18 to 34339

Williamson County, Illinois Veterans by Age

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Name Veterans % of Total
White4,98510.41%
Black2209.16%
Hispanic736.18%
2+ Races628.70%
Other Race284.72%
Native American32.00%

Williamson County, Illinois Veterans by Race

Williamson County, Illinois Veterans by Education

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6.83%

Veteran Poverty Rate

38.61%

Veteran Disability Rate

Williamson County, Illinois Veterans by Education

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56.9%

Labor Force Participation

53.5%

Employment Rate

5.7%

Unemployment Rate

Williamson County, Illinois Employment by Age

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Williamson County, Illinois Employment by Race

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Williamson 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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76.86%

Born in Williamson County, Illinois

98.22%

Native Born

1.78%

Foreign Born

0.89%

Non Citizen

0.90%

Naturalized

Place of Birth

98.22% of Williamson County, Illinois residents were born in the United States, with 76.86% having been born in Illinois. 0.89% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Williamson 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