COUNTY · 2000 CENSUS

Rock Island County

Illinois · 149,374 residents · 427.496 sq mi

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The short version

Rock Island County has roughly average household income, with a median household income of $38,608. Population has held roughly steady since 1990. Median home value has risen by half since 1990, reaching $77,800.

At a glance

Lower income

below the US median

US median: $42,589

Older

median age 37.8

US median: 35.2

Less educated

17% hold a bachelor's degree

US average: 24%

Stable housing

home values roughly flat, inflation adjusted

US median home: $120,530

Section 01

Population & growth

Total population

149,374

Unchangedsince 1990

from 148,723 in 1990

1990 – 2025

Population density

349 / sq mi

Unchangedsince 1990

from 348 / sq mi in 1990

US average: 242

Median age

37.8

+8%since 1990

from 35.0 in 1990

US average: 35.2

Population, 1990 – 2024

2024143K

Section 02

Income & economy

Median household income

$38,608

+9%inflation adjusted, since 1990

from $26,803 in 1990

US average: $42,589

1990 – 2024

Per capita income

$20,164

+53%since 1990

from $13,214 in 1990

US average: $21,522

Poverty rate

10.7%

−2.4 ptssince 1990

from 13.2% in 1990

US average: 12.4%

Section 03

Housing

Median home value

$77,800

+24%inflation adjusted, since 1990

from $47,600 in 1990

US average: $120,530

1990 – 2024

Median gross rent

$450

+3%inflation adjusted, since 1990

from $331 in 1990

US average: $602

Owner-occupied

69.7%

+2.8 ptssince 1990

from 66.9% in 1990

30.3% rent

Afford Score

2.0

+13%since 1990

from 1.8 in 1990

1990 – 2024

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

Section 04

Race & ethnicity

1990

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

Black7%(10,476)

Hispanic / Latino5.2%(7,770)

Asian0.6%(932)

Diversity Score33.2%(49,303)

2000

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

Black7.4%(11,099)

Hispanic / Latino8.6%(12,791)

Asian1%(1,499)

Diversity Score37.8%(56,399)

Diversity Score

+14%since 1990

from 33 in 1990

1990 – 2024

Section 05

Education

Bachelor's degree or higher

17.1%

+2.1 ptssince 1990

from 15.0% in 1990

US average: 24.4%

High school or higher

82.6%

+5.2 ptssince 1990

from 77.4% in 1990

US average: 80.3%

Graduate degree

5.6%

+1.1 ptssince 1990

from 4.5% in 1990

US average: 8.8%

Section 06

Commute & transportation

Average commute

11.3 min

−30%since 1990

from 16.1 min in 1990

US average: 17.6

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+103%

Home value$222,000+185%

Population175,259+24%

SEE FULL COMPARISON →

ROCK ISLAND COUNTY VS

Mercer County

Income$74,182+92%

Home value$146,700+89%

Population15,229−89%

SEE FULL COMPARISON →

ROCK ISLAND COUNTY VS

Henry County

Income$71,911+86%

Home value$151,600+95%

Population48,095−66%

SEE FULL COMPARISON →

ROCK ISLAND COUNTY VS

Muscatine County

Income$69,396+80%

Home value$182,100+134%

Population41,853−70%

SEE FULL COMPARISON →

Frequently asked

How many people live in Rock Island County, Illinois?

Rock Island County, Illinois has about 149,374 residents according to the 2000 Census.

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

The typical household in Rock Island County, Illinois earns about $38,608 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 $77,800, and the typical rent is about $450 a month.

How educated are people in Rock Island County, Illinois?

About 17.1% 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 10.7% of people in Rock Island County, Illinois live below the federal poverty line.

Has Rock Island County, Illinois grown since 1990?

Yes, Rock Island County, Illinois has grown since 1990. The population has added about 651 residents, a change of about 0 percent over that period.

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

How we source and harmonize this data →