COUNTY · 1990 CENSUS

Rock Island County

Illinois · 148,723 residents · 427.496 sq mi

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The short version

Rock Island County has lower-than-average household income, with a median household income of $26,803. Population has held roughly steady since 2000. Median home value is $47,600.

At a glance

Lower income

below the US median

US median: $30,130

Mid-age

median age 35.0

US median: 33.0

Less educated

15% hold a bachelor's degree

US average: 20%

More affordable

home values down 19%, inflation adjusted

US median home: $93,722

Section 01

Population & growth

Total population

148,723

Unchangedvs 2000

vs 149,374 in 2000

1990 – 2025

Population density

348 / sq mi

Unchangedvs 2000

vs 349 / sq mi in 2000

US average: 221

Median age

35.0

−8%vs 2000

vs 37.8 in 2000

US average: 33.0

Population, 1990 – 2024

2024143K

Section 02

Income & economy

Median household income

$26,803

−9%inflation adjusted, since 2000

vs $38,608 in 2000

US average: $30,130

1990 – 2024

Per capita income

$13,214

−34%vs 2000

vs $20,164 in 2000

US average: $14,340

Poverty rate

13.2%

+2.4 ptsvs 2000

vs 10.7% in 2000

US average: 13.2%

Section 03

Housing

Median home value

$47,600

−19%inflation adjusted, since 2000

vs $77,800 in 2000

US average: $93,722

1990 – 2024

Median gross rent

$331

−3%inflation adjusted, since 2000

vs $450 in 2000

US average: $450

Owner-occupied

66.9%

−2.8 ptsvs 2000

vs 69.7% in 2000

33.1% rent

Afford Score

1.8

−12%vs 2000

vs 2.0 in 2000

1990 – 2024

RELATED:See current rent listings in Rock Island County on RentDataNow

Section 04

Race & ethnicity

2000

White, non-Hispanic81.5%(121,705)

Black7.4%(11,099)

Hispanic / Latino8.6%(12,791)

Asian1%(1,499)

Other0%

Diversity Score37.8%(56,399)

1990

White, non-Hispanic89.7%(133,451)

Black7%(10,476)

Hispanic / Latino5.2%(7,770)

Asian0.6%(932)

Other2.6%(3,864)

Diversity Score33.2%(49,303)

Diversity Score

−12%vs 2000

vs 38 in 2000

1990 – 2024

Section 05

Education

Bachelor's degree or higher

15.0%

−2.1 ptsvs 2000

vs 17.1% in 2000

US average: 20.3%

High school or higher

77.4%

−5.2 ptsvs 2000

vs 82.6% in 2000

US average: 75.2%

Graduate degree

4.5%

−1.1 ptsvs 2000

vs 5.6% in 2000

US average: 7.1%

Section 06

Commute & transportation

Average commute

16.1 min

+42%vs 2000

vs 11.3 min in 2000

US average: 21.9

Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Drill deeper

Places similar to Rock Island County

Head to head

Compare Rock Island County to nearby counties

ROCK ISLAND COUNTY VS

Scott County

Income$78,277+192%

Home value$222,000+366%

Population175,259+24%

SEE FULL COMPARISON →

ROCK ISLAND COUNTY VS

Mercer County

Income$74,182+177%

Home value$146,700+208%

Population15,229−89%

SEE FULL COMPARISON →

ROCK ISLAND COUNTY VS

Henry County

Income$71,911+168%

Home value$151,600+218%

Population48,095−66%

SEE FULL COMPARISON →

ROCK ISLAND COUNTY VS

Muscatine County

Income$69,396+159%

Home value$182,100+283%

Population41,853−70%

SEE FULL COMPARISON →

Frequently asked

How many people live in Rock Island County, Illinois?

Rock Island County, Illinois has about 148,723 residents according to the 1990 Census.

What is the median household income in Rock Island County, Illinois?

The typical household in Rock Island County, Illinois earns about $26,803 a year. Half of households make more than that, and half make less.

Is Rock Island County, Illinois expensive?

In Rock Island County, Illinois, the median home is worth about $47,600, and the typical rent is about $331 a month.

How educated are people in Rock Island County, Illinois?

About 15.0% of adults age 25 and over in Rock Island County, Illinois hold a bachelor's degree or higher.

What is the poverty rate in Rock Island County, Illinois?

About 13.2% of people in Rock Island County, Illinois live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →