Rock Island County, Illinois Demographics 2026

Name: Rock Island County, Illinois Demographics
Creator: U.S. Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Rock Island County, Illinois has a population of 142,757, the 14th most populous county in Illinois. The median household income is $67,159 and the median home value is $150,400. The poverty rate is 15.5%.

Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes

Rock Island County Quick Facts

Population 142,757

Median Household Income $67,159

Median Home Value $150,400

Poverty Rate 15.5%

Unemployment Rate 5.6%

Median Age 40.3 years

Homeownership Rate 69.7%

Affordability Ratio 2.2x

Bachelor's Degree+ 24.7%

High School Graduation 90.7%

Cities/Places 24

Population 142,757 14th of 102

Median Income $67,159 19% lower than state

Poverty Rate 15.5%

Unemployment 5.6%

How Rock Island County Changed

Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.

Metric	2019–2023	2020–2024	Change
Population	142,995	142,757	-0.2%
Median household income	$66,768	$67,159	+0.6%
Median home value	$144,700	$150,400	+3.9%

Median Household Income

Rock Island

$67,159

$83,390

National

$80,734

Median Home Value

Rock Island

$150,400

$263,300

National

$332,700

Economy & Housing

Household Income Distribution

Under $25K 17.4%

$25K-$50K 20.9%

$50K-$100K 30.6%

$100K+ 31.1%

Detailed income brackets

Under $10K

6.4%

$10K-$15K

4.1%

$15K-$20K

3.1%

$20K-$25K

3.8%

$25K-$30K

4.3%

$30K-$35K

4.0%

$35K-$40K

4.6%

$40K-$45K

4.7%

$45K-$50K

3.3%

$50K-$60K

6.5%

$60K-$75K

10.4%

$75K-$100K

13.8%

$100K-$125K

9.8%

$125K-$150K

7.2%

$150K-$200K

8.0%

$200K+

6.0%

Employment

5.6% Unemployment Rate State: 5.8%|National: 5.2%

61.2% Labor Force Participation

Housing Overview

Owner 69.7%

Renter 30.3%

Affordability Index Very Affordable

2.2x home value to income ratio

Median gross rent $889/mo 15.9% of median household income annually

People & Demographics

Age Distribution

Under 18

22.5%

18-34

20.9%

35-54

23.6%

55-74

24.4%

75+

8.6%

Race & Ethnicity

Diversity Index

Moderate Diversity

Moderate diversity with one or two groups making up the majority.

State average: 61 | National average: 61

Education

Educational Attainment (Adults 25+)

Cities & Places in Rock Island County

City	Population	Median Income	Poverty	Home Value
Moline	42,197	$67,701	15.5%	$146,300
Rock Island	36,151	$59,041	21.0%	$125,900
East Moline	20,904	$61,779	19.8%	$134,600
Silvis	7,955	$62,375	15.4%	$161,600
Milan	5,034	$62,597	12.3%	$119,300
Coal Valley	4,229	$106,850	3.9%	$215,700
Carbon Cliff	2,151	$55,536	19.1%	$134,600
Hampton	1,926	$90,406	4.7%	$184,900
Port Byron	1,854	$111,667	7.3%	$278,200
Andalusia	1,021	$77,222	4.8%	$168,000
Rapids City	980	$83,125	3.3%	$203,700
Coyne Center	904	$115,156	8.4%	$221,400
Cordova	666	$84,167	5.5%	$181,300
Reynolds	584	$76,458	20.7%	$151,200
Rock Island Arsenal	470	N/A	0.0%	N/A
Hillsdale	451	$86,250	10.0%	$99,200
Edgington	390	$91,964	13.6%	$153,800
Oak Grove	277	$40,972	26.0%	$14,200
Taylor Ridge	276	N/A	6.5%	$181,100
Campbell's Island	203	$70,531	0.0%	$155,100
Illinois City	73	N/A	0.0%	N/A
Joslin	56	$42,188	0.0%	$131,000
Barstow	34	$77,813	0.0%	$159,400
Buffalo Prairie	9	N/A	0.0%	N/A

Explore Illinois Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

Rock Island County is located in Illinois with a total population of 142,757. It is the 14th most populous county out of 102 in Illinois. The county encompasses 24 Census-designated places.

Age Demographics

The median age in Rock Island County is 40.3 years. This is 3% higher than the state median of 39.0 years.

Economy, Income & Housing

The median household income in Rock Island County is $67,159. This is 19% lower than the state median of $83,390. It is also 17% lower than the national median of $80,734. The poverty rate stands at 15.5%. This is 31% higher than the state poverty rate of 11.8%. The unemployment rate is 5.6%. This is 4% lower than the state rate of 5.8%. The median home value is $150,400. Housing costs are 43% lower than the state median of $263,300. With a home-value-to-income ratio of just 2.2x, Rock Island County is one of the most affordable housing markets in the area. 69.7% of occupied housing units are owner-occupied. This homeownership rate is 4% higher than the state average of 67.1%.

Race & Ethnicity

The largest racial or ethnic group in Rock Island County is White (non-Hispanic), making up 67.4% of the population. Hispanic or Latino residents account for 14.2%. The Asian population (2.6%) is well below the state average of 5.9%.

Education

24.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 35% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.7%.

Data Sources & Methodology

All figures for Rock Island County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Illinois and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.

Frequently Asked Questions

What is the population of Rock Island County, Illinois?

Rock Island County has a population of 142,757, making it the 14th most populous county in Illinois.

What is the median income in Rock Island County?

The median household income in Rock Island County is $67,159 with a poverty rate of 15.5%.

How many cities are in Rock Island County, Illinois?

Rock Island County contains 24 Census-designated places.