Rock Island County, Illinois Population 2024

138,597

Rock Island County, Illinois's estimated 2024 population is 138,597 with a growth rate of -1.05% 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 147,613 and has seen a growth of -6.11% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
2029131,272-1,465-1.1%
2028132,737-1,465-1.09%
2027134,202-1,465-1.08%
2026135,667-1,465-1.07%
2025137,132-1,465-1.06%
2024138,597-1,465-1.05%
2023140,062-1,465-1.04%
2022141,527-1,465-1.02%
2021142,992-1,367-0.95%
2020144,3592,5841.82%
2019141,775-747-0.52%
2018142,522-1,302-0.91%
2017143,824-1,153-0.8%
2016144,977-1,184-0.81%
2015146,161-929-0.63%
2014147,090-596-0.4%
2013147,686-13-0.01%
2012147,6992250.15%
2011147,474-139-0.09%
2010147,61300%
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%
192092,29721,89331.1%
191070,40415,15527.43%
190055,24913,33231.81%
189041,9173,6159.44%
188038,3028,51928.6%
187029,7838,77841.79%
186021,00514,068202.8%
18506,9374,327165.79%
18402,610-128,662-98.01%
showing: 36 rows
2024 Growth Rate
-1.05% (-1,465)
County Website
Rock Island County
County Seat
2020 Population
144,359
Area
427 mi²
Density
325 people/mi²
Growth Since 2020
-3.99% (-5,762)
Founded
1831

Rock Island County, Illinois Population 2024

Population by Race

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Race
Population
Percentage (of total)
White107,91975.04%
Black or African American15,40410.71%
Two or more races10,0156.96%
Other race6,1624.28%
Asian3,7742.62%
Native American3080.21%
Native Hawaiian or Pacific Islander2370.16%

White

Black or African American

Two or more races

Other race

Asian

Native American

Native Hawaiian or Pacific Islander

Rock Island County, Illinois Population by Race

Rock Island County, Illinois Population Pyramid 2024

Rock Island County, Illinois Median Age

40.2

Total

39

Male

41.5

Female

Rock Island County, Illinois Adults

There are 111,730 adults, (28,436 of whom are seniors) in Rock Island County, Illinois.

Rock Island County, Illinois Age Dependency

72.7

Age Dependency Ratio

34.1

Old Age Dependency Ratio

38.5

Child Dependency Ratio

Rock Island County, Illinois Sex Ratio

Female72,50150.41%
Male71,31849.59%

Rock Island County, Illinois Population by Age

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

Household Type
Count
Average Size
Owner
Renter
All61,0142.2868.631.4
Married26,8322.9887.912.1
Non Family23,7981.1853.946.1
Female7,52535149
Male2,8592.9156.243.8

2.9

Average Family Size

2.28

Average Household Size

68.6%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Rock Island County, Illinois Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Rock Island County, Illinois Educational Attainment by Sex (over 25)

Rock Island County, Illinois Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among white people with a rate of 93.67%.

The highest rate of bachelors degrees is among asian people with a rate of 47.16%.

Rock Island County, Illinois Educational Attainment by Race

All

Male

Female

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$43,826

Average Earnings

$52,558

Average Male

$36,296

Average Female

Rock Island County, Illinois Earnings by Educational Attainment

Rock Island County, Illinois Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Rock Island County, Illinois Language

86.7% of Rock Island County, Illinois residents speak only English, while 13.3% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.62% of the population.

Rock Island County, Illinois Language

Rock Island County, Illinois Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White97,61210,25510.51%
Black14,2994,88634.17%
Hispanic18,7903,95321.04%
Multiple9,5302,21423.23%
Other6,0601,16219.17%
Asian3,58996226.8%
Native2886221.53%
Islander2373414.35%

15.17%

Overall Poverty Rate

14.49%

Male Poverty Rate

15.82%

Female Poverty Rate

Poverty in Rock Island County, Illinois

The race most likely to be in poverty in Rock Island County, Illinois is Black, with 34.17% below the poverty level.

The race least likely to be in poverty in Rock Island County, Illinois is White, with 10.51% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.28%. Among those working part-time, it was 19.13%, and for those that did not work, the poverty rate was 19.87%.

Rock Island County, Illinois Poverty

rate

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Rate
Poverty
Less Than 9th Grade30.94%
High School13.97%
Some College9.2%
Bachelors or Greater3.76%

Rock Island County, Illinois Poverty Rate by Education

rate

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Rate
Poverty
Female Unemployed40.25%
Male Unemployed39.21%
Female Employed9.56%
Male Employed6.29%

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

Rock Island County, Illinois Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Rock Island County, Illinois Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

48.0%

Overall Marriage Rate

49.6%

Male Marriage Rate

46.4%

Female Marriage Rate

Rock Island County, Illinois Married by Age and Sex

male

female

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 45-54.

Rock Island County, Illinois Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Rock Island County, Illinois Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

8,560

Number of Veterans

7,657

Male Veterans

903

Female Veterans

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Rock Island County, Illinois Veterans by War

count

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Rock Island County, Illinois Veterans by Age

count

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Rock Island County, Illinois Veterans by Race

Rock Island County, Illinois Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

7.27%

Veteran Poverty Rate

23.42%

Veteran Disability Rate

Rock Island County, Illinois Veterans by Education

LaborForceParticipation

61.9%

Labor Force Participation

57.9%

Employment Rate

6.2%

Unemployment Rate

Rock Island County, Illinois Employment by Age

LaborForceParticipation

Rock Island County, Illinois Employment by Race

LaborForceParticipation

Rock Island County, Illinois Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

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

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

64.74%

Born in Rock Island County, Illinois

92%

Native Born

8%

Foreign Born

4.49%

Non Citizen

3.51%

Naturalized

Place of Birth

92% of Rock Island County, Illinois residents were born in the United States, with 64.74% having been born in Illinois. 4.49% 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

Sources