Rock Island County, Illinois Population 2021

Rock Island County, Illinois's estimated population is 140,395 with a growth rate of -0.53% in the past year according to the most recent United States census data. Rock Island County, Illinois is the 15th largest county in Illinois. The 2010 Population was 147,610 and has seen a growth of -4.89% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021140,395-742-0.53%
2020141,137-742-0.52%
2019141,879-742-0.52%
2018142,621-1,207-0.84%
2017143,828-1,115-0.77%
2016144,943-1,151-0.79%
2015146,094-941-0.64%
2014147,035-615-0.42%
2013147,650-22-0.01%
2012147,6722150.15%
2011147,457-153-0.10%
2010147,610-1,113-0.75%
1990148,723-17,245-10.39%
1980165,968-766-0.46%
1970166,73415,74310.43%
1960150,99117,43313.05%
1950133,55820,23517.86%
1940113,32315,13215.41%
193098,1915,8946.39%
192092,29721,89331.10%
191070,40415,15527.43%
190055,24913,33231.81%
189041,9173,6159.44%
188038,3028,51928.60%
187029,7838,77841.79%
186021,00514,068202.80%
18506,9374,327165.79%
18402,6100.00%
2021 Growth Rate
-0.53%
County Website
Founded
1831
County Seat
2010 Population
147,610
Growth Since 2010
-4.89%
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Rock Island County, Illinois Population Growth

Population by Race

Race Population Percentage
White115,40580.21%
Black or African American14,96810.40%
Two or More Races5,2663.66%
Some Other Race3,9412.74%
Asian3,6502.54%
American Indian and Alaska Native5820.40%
Native Hawaiian and Other Pacific Islander610.04%
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Rock Island County, Illinois Population by Race

Rock Island County, Illinois Population Pyramid $2021

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Rock Island County, Illinois Median Age

40.1


Total

38.8


Male

41.9


Female

Rock Island County, Illinois Adults

There are 111,739 adults, (27,050 of whom are seniors) in Rock Island County, Illinois.

Rock Island County, Illinois Age Dependency

69.9

Age Dependency Ratio

31.9

Old Age Dependency Ratio

37.9

Child Dependency Ratio

Rock Island County, Illinois Sex Ratio

Female

72,975

50.72%

Male

70,898

49.28%

Rock Island County, Illinois Population by Age

Rock Island County, Illinois Renter vs Owner Occupied by Household Type

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Rock Island County, Illinois Household Types

Type Owner Renter
Married85.9%14.1%
All68%32%
Male61.4%38.6%
Non Family56.2%43.8%
Female44.8%55.2%

68.0%

Rate of Home Ownership

Rock Island County, Illinois Households and Families

Type Count Average Size Owned
All60,5462.368
Married26,5752.9585.9
Non Family23,0211.1656.2
Female7,9693.0844.8
Male2,9813.0761.4

2.92

Average Family Size

2.3

Average Household Size

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Rock Island County, Illinois Households by Type

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Education Attained Count Percentage
Less Than 9th Grade3,7463.78%
9th to 12th Grade7,5327.60%
High School Graduate29,19829.45%
Some College25,14725.37%
Associates Degree10,16610.26%
Bachelors Degree14,97415.11%
Graduate Degree8,3688.44%
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Rock Island County, Illinois Educational Attainment by Sex (over 25)

Rock Island County, Illinois Educational Attainment by Race

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Race Total High School Bachelors
White77,23771,50519,715
Hispanic9,7336,8611,268
Black8,6876,6031,109
Asian2,2241,727955
Other Race2,1761,415238
2+ Races1,6861,421356
Native American41434886
Islander282413

The highest rate of high school graduation is among white people with a rate of 92.58%.

The highest rate of bachelors degrees is among islander people with a rate of 46.43%.

Rock Island County, Illinois Educational Attainment by Race

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Name Average Male Female
Overall$37,867$45,440$30,760
Less Than 9th Grade$24,852$27,052$19,058
High School Graduate$31,373$40,685$22,495
Some College$35,757$44,560$29,972
Bachelors Degree$50,289$59,002$42,460
Graduate Degree$65,360$68,491$63,924

$37,867

Average Earnings

$45,440

Average Male

$30,760

Average Female

Rock Island County, Illinois Earnings by Educational Attainment

Rock Island County, Illinois Language by Age

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Rock Island County, Illinois Language

86.26% of Rock Island County, Illinois residents speak only English, while 13.74% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 8.42% of the population.

Rock Island County, Illinois Language

Rock Island County, Illinois Poverty by Race

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Name Total In Poverty Poverty Rate
White100,30110,20210.17%
Black13,8634,39131.67%
Hispanic17,9633,11017.31%
Multiple5,0431,42128.18%
Other3,92569917.81%
Asian3,43857916.84%
Native57615326.56%
Islander602745.00%

13.96%

Overall Poverty Rate

12.19%

Male Poverty Rate

15.65%

Female Poverty Rate

Poverty in Rock Island County, Illinois

The race most likely to be in poverty in Rock Island County, Illinois is Islander, with 45.00% below the poverty level.

The race least likely to be in poverty in Rock Island County, Illinois is White, with 10.17% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.52%. Among those working part-time, it was 17.38%, and for those that did not work, the poverty rate was 19.09%.

Rock Island County, Illinois Poverty

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Name Poverty
Less Than 9th Grade24.78%
High School12.38%
Some College9.06%
Bachelors or Greater3.33%

Rock Island County, Illinois Poverty Rate by Education

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Rate Poverty
Female Unemployed41.64%
Male Unemployed31.93%
Female Employed8.92%
Male Employed4.39%

Rock Island County, Illinois Poverty Rate by Employment Status and Sex

Rock Island County, Illinois Income by Household Type

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Name Median Mean
Households$54,858$69,960
Families$70,262$83,924
Married Families$85,076$98,823
Non Families$34,580$44,651
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Income by Household Type

Rock Island County, Illinois Marital Status

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Marriage Rates

47.9%

Overall Marriage Rate

49.1%

Male Marriage Rate

46.7%

Female Marriage Rate

Rock Island County, Illinois Married by Age and Sex

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Rock Island 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.

Rock Island County, Illinois Marital Status by Race

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Rock Island County, Illinois Marital Status

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9,382

Number of Veterans

8,731

Male Veterans

651

Female Veterans

War Veterans
Vietnam3,652
First Gulf War1,480
Second Gulf War1,202
Korea821
World War II367

Rock Island County, Illinois Veterans by War

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Age Group Veterans
65 to 742,805
75+2,441
35 to 541,864
55 to 641,631
18 to 34641

Rock Island County, Illinois Veterans by Age

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Name Veterans % of Total
White8,6649.29%
Black5104.92%
Hispanic4043.38%
2+ Races1124.78%
Asian361.38%
Other Race311.21%
Native American296.04%

Rock Island County, Illinois Veterans by Race

Rock Island County, Illinois Veterans by Education

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7.13%

Veteran Poverty Rate

25.96%

Veteran Disability Rate

Rock Island County, Illinois Veterans by Education

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62.6%

Labor Force Participation

58.9%

Employment Rate

5.7%

Unemployment Rate

Rock Island County, Illinois Employment by Age

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Rock Island County, Illinois Employment by Race

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Rock Island 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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64.40%

Born in Rock Island County, Illinois

92.02%

Native Born

7.98%

Foreign Born

4.83%

Non Citizen

3.15%

Naturalized

Place of Birth

92.02% of Rock Island County, Illinois residents were born in the United States, with 64.40% having been born in Illinois. 4.83% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Rock Island 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