Cook County, Illinois Population 2021

Cook County, Illinois's estimated population is 5,106,780 with a growth rate of -0.42% in the past year according to the most recent United States census data. Cook County, Illinois is the 2nd largest county in Illinois. The 2010 Population was 5,199,020 and has seen a growth of -1.77% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
20215,106,780-21,730-0.42%
20205,128,510-21,720-0.42%
20195,150,230-21,730-0.42%
20185,171,960-28,860-0.55%
20175,200,820-23,450-0.45%
20165,224,270-19,820-0.38%
20155,244,090-10,590-0.20%
20145,254,6801,8000.03%
20135,252,88013,5300.26%
20125,239,35019,5700.37%
20115,219,78020,7600.40%
20105,199,02093,9501.84%
19905,105,070-148,590-2.83%
19805,253,660-238,710-4.35%
19705,492,370362,6507.07%
19605,129,720620,93013.77%
19504,508,790445,45010.96%
19404,063,34081,2202.04%
19303,982,120929,10030.43%
19203,053,020647,79026.93%
19102,405,230566,49030.81%
19001,838,740646,82054.27%
18901,191,920584,39696.19%
1880607,524257,55873.60%
1870349,966205,012141.43%
1860144,954101,569234.11%
185043,38533,184325.30%
184010,2010.00%
2021 Growth Rate
-0.42%
County Website
County Seat
2010 Population
5,199,020
Growth Since 2010
-1.77%
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Cook County, Illinois Population Growth

Population by Race

Race Population Percentage
White2,946,31256.68%
Black or African American1,217,42123.42%
Some Other Race500,0699.62%
Asian379,4447.30%
Two or More Races138,1392.66%
American Indian and Alaska Native14,9110.29%
Native Hawaiian and Other Pacific Islander1,9820.04%
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Cook County, Illinois Population by Race

Cook County, Illinois Population Pyramid $2021

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Cook County, Illinois Median Age

36.8


Total

35.6


Male

38


Female

Cook County, Illinois Adults

There are 4,053,170 adults, (741,170 of whom are seniors) in Cook County, Illinois.

Cook County, Illinois Age Dependency

57

Age Dependency Ratio

22.4

Old Age Dependency Ratio

34.6

Child Dependency Ratio

Cook County, Illinois Sex Ratio

Female

2,675,330

51.47%

Male

2,522,950

48.53%

Cook County, Illinois Population by Age

Cook County, Illinois Renter vs Owner Occupied by Household Type

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Cook County, Illinois Household Types

Type Owner Renter
Married76.2%23.8%
All56.9%43.1%
Male51.7%48.3%
Female43.7%56.3%
Non Family42.6%57.4%

56.9%

Rate of Home Ownership

Cook County, Illinois Households and Families

Type Count Average Size Owned
All1,972,1102.5956.9
Married805,4153.4276.2
Non Family788,8361.2642.6
Female279,8573.5943.7
Male98,0003.5651.7

3.39

Average Family Size

2.59

Average Household Size

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Cook County, Illinois Households by Type

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Education Attained Count Percentage
Less Than 9th Grade234,1486.53%
9th to 12th Grade227,7326.35%
High School Graduate829,45123.12%
Some College666,60718.58%
Associates Degree237,1236.61%
Bachelors Degree825,67323.01%
Graduate Degree566,84215.80%
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Cook County, Illinois Educational Attainment by Sex (over 25)

Cook County, Illinois Educational Attainment by Race

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Race Total High School Bachelors
White1,691,1101,602,820889,945
Black809,334706,360182,936
Hispanic761,888522,883118,980
Other Race290,419183,65732,806
Asian279,637251,284176,350
2+ Races64,49458,21529,715
Native American10,0957,1212,122
Islander1,3211,136441

The highest rate of high school graduation is among white people with a rate of 94.78%.

The highest rate of bachelors degrees is among asian people with a rate of 63.06%.

Cook County, Illinois Educational Attainment by Race

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Name Average Male Female
Overall$44,142$50,608$38,954
Less Than 9th Grade$25,664$29,574$20,922
High School Graduate$30,709$35,106$25,345
Some College$37,443$44,593$31,430
Bachelors Degree$59,918$69,460$52,135
Graduate Degree$77,981$95,293$67,119

$44,142

Average Earnings

$50,608

Average Male

$38,954

Average Female

Cook County, Illinois Earnings by Educational Attainment

Cook County, Illinois Language by Age

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Cook County, Illinois Language

64.72% of Cook County, Illinois residents speak only English, while 35.28% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 20.77% of the population.

Cook County, Illinois Language

Cook County, Illinois Poverty by Race

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Name Total In Poverty Poverty Rate
Black1,191,250298,16025.03%
Hispanic1,302,740218,22216.75%
White2,158,910161,6187.49%
Other497,02689,98618.10%
Asian372,99545,15512.11%
Multiple136,05319,91214.64%
Native14,6792,84519.38%
Islander1,90229515.51%

14.37%

Overall Poverty Rate

12.87%

Male Poverty Rate

15.77%

Female Poverty Rate

Poverty in Cook County, Illinois

The race most likely to be in poverty in Cook County, Illinois is Black, with 25.03% below the poverty level.

The race least likely to be in poverty in Cook County, Illinois is White, with 7.49% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.45%. Among those working part-time, it was 16.03%, and for those that did not work, the poverty rate was 25.14%.

Cook County, Illinois Poverty

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Name Poverty
Less Than 9th Grade23.60%
High School15.48%
Some College11.84%
Bachelors or Greater5.26%

Cook County, Illinois Poverty Rate by Education

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Rate Poverty
Female Unemployed37.14%
Male Unemployed30.00%
Female Employed6.98%
Male Employed4.92%

Cook County, Illinois Poverty Rate by Employment Status and Sex

Cook County, Illinois Income by Household Type

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Name Median Mean
Households$64,660$95,677
Families$80,744$114,487
Married Families$103,038$139,794
Non Families$43,655$64,610
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Income by Household Type

Cook County, Illinois Marital Status

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Marriage Rates

42.2%

Overall Marriage Rate

44.4%

Male Marriage Rate

40.0%

Female Marriage Rate

Cook County, Illinois Married by Age and Sex

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Cook 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.

Cook County, Illinois Marital Status by Race

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Cook County, Illinois Marital Status

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156,000

Number of Veterans

145,118

Male Veterans

10,882

Female Veterans

War Veterans
Vietnam56,330
First Gulf War22,594
Second Gulf War21,551
Korea15,144
World War II8,115

Cook County, Illinois Veterans by War

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Age Group Veterans
75+46,204
65 to 7443,554
35 to 5431,599
55 to 6423,560
18 to 3411,083

Cook County, Illinois Veterans by Age

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Name Veterans % of Total
White97,9144.14%
Black47,4825.10%
Hispanic14,1551.56%
Other Race3,6501.05%
2+ Races3,5634.50%
Asian2,8350.91%
Native American4173.63%
Islander1399.37%

Cook County, Illinois Veterans by Race

Cook County, Illinois Veterans by Education

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8.29%

Veteran Poverty Rate

28.63%

Veteran Disability Rate

Cook County, Illinois Veterans by Education

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66.1%

Labor Force Participation

61.4%

Employment Rate

7%

Unemployment Rate

Cook County, Illinois Employment by Age

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Cook County, Illinois Employment by Race

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Cook 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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61.54%

Born in Cook County, Illinois

78.86%

Native Born

21.14%

Foreign Born

10.43%

Non Citizen

10.71%

Naturalized

Place of Birth

78.86% of Cook County, Illinois residents were born in the United States, with 61.54% having been born in Illinois. 10.43% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Cook 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