Rock Island County, Illinois Population 2020

Rock Island County, Illinois's estimated population is 141,845 with a growth rate of -0.57% in the past year according to the most recent United States census data. Rock Island County, Illinois is the 14th largest county in Illinois.

Year Population Growth Growth Rate
2020141,845-816-0.57%
2019142,661-816-0.57%
2018143,477-816-0.57%
2017144,293-937-0.65%
2016145,230-1,054-0.72%
2015146,284-806-0.55%
2014147,090-598-0.40%
2013147,688-11-0.01%
2012147,6992370.16%
2011147,462-154-0.10%
2010147,616-1,107-0.74%
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%
2020 Growth Rate
-0.57%
County Website
Founded
1831
County Seat

Rock Island County, Illinois Population Growth

Population by Race

Race Population Percentage
White117,54480.91%
Black or African American14,64510.08%
Two or More Races5,4813.77%
Asian3,7152.56%
Some Other Race3,3582.31%
American Indian and Alaska Native4740.33%
Native Hawaiian and Other Pacific Islander580.04%

Rock Island County, Illinois Population Pyramid 2020

Rock Island County, Illinois Median Age

40.1


Total

38.8


Male

41.7


Female

Rock Island County, Illinois Adults

There are 112,750 adults, (26,629 of whom are seniors) in Rock Island County, Illinois.

Rock Island County, Illinois Age Dependency

68.7

Age Dependency Ratio

30.9

Old Age Dependency Ratio

37.8

Child Dependency Ratio

Rock Island County, Illinois Sex Ratio

Female

73,679

50.72%

Male

71,596

49.28%

Rock Island County, Illinois Households and Families

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

Rock Island County, Illinois Household Types

Type Owner Renter
Married85.8%14.2%
All68.7%31.3%
Male63.2%36.8%
Non Family57.1%42.9%
Female46.6%53.4%

68.7%

Rate of Home Ownership

Type Count Average Size Owned
All60,2942.3368.7
Married26,5092.9885.8
Non Family22,7611.1757.1
Female7,9423.1446.6
Male3,0823.2263.2

2.94

Average Family Size

2.33

Average Household Size

6%

Unmarried (Opposite Sex)

0.3%

Unmarried (Same Sex)

Rock Island County, Illinois Education

Education Attained Count Percentage
Less Than 9th Grade3,8263.83%
9th to 12th Grade7,2877.29%
High School Graduate29,90829.93%
Some College25,61925.63%
Associates Degree10,15910.16%
Bachelors Degree15,03215.04%
Graduate Degree8,1128.12%

Rock Island County, Illinois Educational Attainment by Race

Name Total High School Bachelors
White78,15472,39119,308
Hispanic9,6486,7681,275
Black8,5066,5871,228
Asian2,2861,7821,026
Other Race1,9141,303291
Multiple Races1,7421,493374
Native American34829377
Islander363224

The highest rate of high school graduation is among white people with a rate of 92.63%.

The highest rate of bachelors degrees is among islander people with a rate of 66.67%.

Name Average Male Female
Overall$35,739$42,832$28,830
Less Than High School$23,081$27,334$17,979
High School Grad$30,032$36,014$21,363
Some College$34,309$42,469$27,883
Bachelors Degree$47,895$57,432$38,002
Graduate Degree$62,725$64,755$60,894

$35,739

Average Earnings

$42,832

Average Male

$28,830

Average Female

Rock Island County, Illinois Language

Rock Island County, Illinois Language by Age

Rock Island County, Illinois Language

86.42% of Rock Island County, Illinois residents speak only English, while 13.58% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 8.13% of the population.

Rock Island County, Illinois Poverty

Rock Island County, Illinois Poverty by Race

Name Total In Poverty Poverty Rate
White101,38911,45111.29%
Black13,6284,12330.25%
Hispanic17,9243,45319.26%
Multiple5,3111,42226.77%
Other3,34670721.13%
Asian3,57266918.73%
Native46910522.39%
Islander572035.09%

14.84%

Overall Poverty Rate

12.78%

Male Poverty Rate

16.80%

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 35.09% below the poverty level.

The race least likely to be in poverty in Rock Island County, Illinois is White, with 11.29% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.60%. Among those working part-time, it was 18.23%, and for those that did not work, the poverty rate was 20.41%.

Name Poverty
Less Than High School24.81%
High School13.36%
Some College9.75%
Bachelors or Greater3.92%
Name Poverty
Female Unemployed41.30%
Male Unemployed27.04%
Female Employed10.09%
Male Employed4.74%

Rock Island County, Illinois Income

Rock Island County, Illinois Income by Household Type

Name Median Mean
Households$52,630$67,715
Families$65,627$81,219
Married Families$81,186$96,154
Non Families$32,173$42,477

Rock Island County, Illinois Marital Status

Rock Island County, Illinois Marital Status

Marriage Rates

47.5%

Overall Marriage Rate

49.1%

Male Marriage Rate

46.0%

Female Marriage Rate

Rock Island County, Illinois Married by Age and Sex

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

Rock Island County, Illinois Veterans

9,843

Number of Veterans

9,196

Male Veterans

647

Female Veterans

War Veterans
Vietnam3,780
First Gulf War1,409
Second Gulf War1,325
Korea1,020
World War II356
Age Group Veterans
65 to 742,761
75+2,507
35 to 541,882
55 to 641,846
18 to 34847
Name Veterans % of Total
White9,0799.57%
Black5945.85%
Hispanic4013.39%
2 or More1014.14%
Indian276.94%
Other221.00%
Asian200.76%

$Rock Island County, Illinois Veterans by Education

7.25%

Veteran Poverty Rate

25.94%

Veteran Disability Rate

Rock Island County, Illinois Employment Status

62.7%

Labor Force Participation

58.6%

Employment Rate

6.5%

Unemployment Rate

Rock Island County, Illinois Place of Birth

Origin of Non-Citizens

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

Origin of Naturalized Citizens

65.22%

Born in Illinois

92.02%

Native Born

7.98%

Foreign Born

4.79%

Non Citizen

Place of Birth

92.02% of Rock Island County, Illinois residents were born in the United States, with 65.22% having been born in Illinois. 4.79% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

  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