County · Illinois

Rock Island County, Illinois

Rock Island County, Illinois. Rock Island County had 141,869 residents in 2025 by the Census Bureau's estimate, down 1.9% since 2020, a steeper fall than Illinois's (−0.8%). It holds 42 places (15 cities, villages and boroughs, 18 towns and townships and 9 census-designated) and 43 census tracts. GEOID 17161.

Rock Island County is one of the 4 counties of the Davenport-Moline-Rock Island, IA-IL metropolitan statistical area (the Census Bureau's July 2023 delineation).

Residents, July 2025 estimate

141,869

Census Bureau estimate (no margin published)
2020 Census count: 144,672 · ACS 2020-2024: 142,757

Median household income

$67,159

±$1,869 (90% margin)
Illinois: $83,390

Median home value

$150,400

±$3,354 (90% margin)
Illinois: $263,300

Median gross rent

$889

±$21 (90% margin)
Illinois: $1,274

How many people live in Rock Island County, and is it growing?

The 2020 Census counted 144,672 residents in Rock Island County. The Census Bureau estimates 141,869 for July 1, 2025, down 1.9% since 2020, a steeper fall than Illinois's (−0.8%). The 2020-2024 American Community Survey puts the population at 142,757 over 427 square miles of land.

July 2020→2021 −1,872 (142,485)
2021→2022 −1,513 (140,972)
2022→2023 −67 (140,905)
2023→2024 +686 (141,591)
2024→2025 +278 (141,869)

Rock Island County in Illinois. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	Rock Island County	Illinois	Change since 2015-2019
Total population	142,757	12,694,798	−1,116
Households	61,733±532	5,036,449	+1,187
Average household size	2.23±0.02	2.46	−0.07
Housing units	66,759±130	5,457,452	+599

Rock Island County's population since 2000

From 149,374 in 2000 to 141,869 in 2025: down 5.0%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.

2000 Census 149,374
2005 (estimate) 147,067
2010 Census 147,546
2015 (estimate) 146,161
2020 Census 144,672
2025 (estimate) 141,869

Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov

What cities and towns are in Rock Island County?

Rock Island County holds 42 places: 15 cities, villages and boroughs (incorporated places), 18 towns and townships (county subdivisions with their own government) and 9 census-designated places. The largest is Moline with 42,362 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.

Places in Rock Island County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

Moline	city	42,985	42,197±364	$67,701	$146,300	15.5%	100%
Rock Island	city	37,108	36,151±422	$59,041	$125,900	21.0%	100%
South Moline Township	township	36,613	36,127±79	$67,829	$156,600	16.3%	100%
Moline Township	township	22,930	22,570±37	$62,396	$129,100	15.0%	100%
Hampton Township	township	21,709	21,529±44	$63,933	$157,100	15.9%	100%
East Moline	city	21,374	20,904±409	$61,779	$134,600	19.8%	100%
South Rock Island Township	township	18,446	18,160±34	$69,711	$139,000	12.4%	100%
Rock Island Township	township	16,070	15,831±30	$41,155	$96,500	32.9%	100%
Blackhawk Township	township	9,576	9,430±26	$65,414	$138,800	12.3%	100%
Silvis	city	8,003	7,955±29	$62,375	$161,600	15.4%	100%
Milan	village	5,097	5,034±24	$62,597	$119,300	12.3%	100%
Coal Valley Township	township	4,474	4,433±15	$92,372	$195,300	6.9%	100%
Coal Valley	village	3,873	4,229±194	$106,850	$215,700	3.9%	96%
Bowling Township	township	3,287	3,335±19	$101,350	$235,000	5.8%	100%
Andalusia Township	township	2,240	2,318±339	$93,333	$219,400	2.6%	100%
Carbon Cliff	village	1,846	2,151±444	$55,536	$134,600	19.1%	100%
Hampton	village	1,779	1,926±313	$90,406	$184,900	4.7%	100%
Coe Township	township	1,733	2,023±390	$128,250	$347,300	2.7%	100%
Port Byron	village	1,668	1,854±321	$111,667	$278,200	7.3%	100%
Edgington Township	township	1,463	1,505±363	$85,203	$180,700	19.1%	100%
Port Byron Township	township	1,413	1,303±217	$77,083	$219,700	10.3%	100%
Andalusia	village	1,184	1,021±225	$77,222	$168,000	4.7%	100%
Rural Township, Rock Island CountyGEOID 1716166300	township	1,017	778±179	$101,083	$283,300	6.1%	100%
Rapids City	village	964	980±146	$83,125	$203,700	3.3%	100%
Coyne CenterGEOID 1717077	CDP	877	904±256	$115,156	$221,400	8.4%	100%
Cordova Township	township	874	764±116	$110,179	$212,700	4.9%	100%
Drury TownshipGEOID 1716120825	township	758	739±290	$87,031	$198,600	6.1%	100%
Buffalo Prairie TownshipGEOID 1716109512	township	732	565±191	$107,656	$217,300	0.0%	100%
Zuma TownshipGEOID 1716184246	township	705	808±282	$84,468	$210,500	8.1%	100%
Cordova	village	671	666±101	$84,167	$181,300	5.5%	100%
Canoe Creek Township	township	632	539±132	$76,875	$107,100	14.7%	100%
Oak Grove	village	476	277±87	$40,972	$14,200	26.0%	100%
Reynolds	village	498	584±189	$76,458	$151,200	20.7%	94%
Hillsdale	village	417	451±123	$86,250	$99,200	10.0%	100%
EdgingtonGEOID 1722619	CDP	391	390±273	$91,964	$153,800	13.6%	100%
Campbell's IslandGEOID 1710786	CDP	275	203±112	$70,531	$155,100	0.0%	100%
Rock Island ArsenalGEOID 1765104	CDP	182	470±403	not published	not published	0.0%	100%
Illinois CityGEOID 1737062	CDP	159	73±71	not published	not published	0.0%	100%
Taylor RidgeGEOID 1774548	CDP	141	276±199	not published	$181,100	6.5%	100%
BarstowGEOID 1703987	CDP	89	34±33	$77,813	$159,400	0.0%	100%
JoslinGEOID 1738726	CDP	85	56±31	$42,188	$131,000	0.0%	100%
Buffalo PrairieGEOID 1709499	CDP	64	9±15	not published	not published	0.0%	100%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov

Who lives in Rock Island County?

The median resident of Rock Island County is 40.3 years old; 22.5% are under 18 and 20.4% are 65 or older. The largest group is non-Hispanic white residents at 67.4%, then Hispanic or Latino residents (of any race) at 14.2%. 8.7% of residents were born outside the United States.

Age, origin and education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
Measure	Rock Island County	Illinois	Change since 2015-2019
Median age	40.3±0.3	39.0	no clear change
Under 18 years	22.5%	21.8%	–
65 years and over	20.4%±0.1 pts	17.0%	–
Hispanic or Latino (any race)	14.2%	18.8%	+1.3 pts
White alone, not Hispanic	67.4%±0.3 pts	58.1%	−4.4 pts
Black or African American alone, not Hispanic	10.9%±0.5 pts	13.3%	+1.1 pts
Asian alone, not Hispanic	2.6%±0.2 pts	5.9%	no clear change
American Indian and Alaska Native alone, not Hispanic	0.1%±0.1 pts	0.1%	–
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0.0%±0.1 pts	0.0%	–
Two or more races, not Hispanic	4.4%±0.6 pts	3.4%	–
Some other race alone, not Hispanic	0.4%±0.2 pts	0.4%	–
Born outside the United States	8.7%±0.6 pts	14.7%	no clear change
Speak a language other than English at home (age 5+)	13.8%±1.0 pts	24.0%	–
Civilian veterans (age 18+)	7.1%±0.5 pts	4.8%	–
With a disability	15.4%±0.8 pts	12.1%	–
No health insurance coverage	6.1%±0.7 pts	6.9%	no clear change
High school graduate or higher (age 25+)	90.7%±0.7 pts	90.5%	–
Bachelor's degree or higher (age 25+)	24.7%±1.3 pts	37.8%	no clear change
Graduate or professional degree (age 25+)	9.0%±0.6 pts	15.3%	–
Moved from another state in the past year	2.4%±0.4 pts	1.6%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov

What do households in Rock Island County earn?

Half of Rock Island County's 61,733 households earn less than $67,159 a year (±$1,869), against $83,390 in Illinois. In 2015-2019 it was $67,513 in 2024 dollars; the margins of error cannot tell the two periods apart. 15.5% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	Rock Island County	Illinois	Change since 2015-2019
Median household income	$67,159±$1,869	$83,390	no clear change
Mean household income	$85,299±$2,017	$115,638	–
Per capita income	$36,842±$864	$46,406	no clear change
People below the poverty line	15.5%±1.1 pts	11.8%	+1.5 pts
Children under 18 below the poverty line	23.7%±2.8 pts	15.1%	no clear change
Households receiving SNAP	15.9%±1.2 pts	13.8%	–
Households with a broadband subscription	90.5%±0.9 pts	90.8%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What does housing cost in Rock Island County?

Owners occupy 69.7% of Rock Island County's occupied homes and renters 30.3%. The median owner-occupied home is valued at $150,400 by its owner (±$3,354). The median renter pays $889 a month including utilities, and 39.3% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	Rock Island County	Illinois	Change since 2015-2019
Median home value (owner-occupied)	$150,400±$3,354	$263,300	no clear change
Median gross rent	$889±$21	$1,274	−$32
Renters paying 35% or more of income on rent	39.3%±2.9 pts	39.0%	+6.5 pts
Median monthly owner costs, with a mortgage	$1,360±$28	$1,987	–
Owner-occupied homes	69.7%±1.2 pts	67.1%	+1.7 pts
Housing units	66,759±130	5,457,452	+599
Homeowner vacancy rate	0.7%±0.3 pts	1.0%	–
Rental vacancy rate	6.4%±1.4 pts	5.0%	–
Single-family detached homes	70.2%±1.3 pts	58.2%	–
Mobile homes	2.7%±0.4 pts	2.3%	–
Built 2020 or later	0.5%±0.1 pts	0.7%	–
Built 1939 or earlier	21.9%±1.0 pts	20.2%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov

How many new homes is Rock Island County building?

Builders took permits for 187 new housing units across Rock Island County in 2025 (73 single-family), 1.3 per 1,000 residents.

2019 98 units
2020 113 units
2021 145 units
2022 105 units
2023 88 units
2024 140 units
2025 187 units

Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey

How do people in Rock Island County get to work?

77.0% of Rock Island County's workers drive alone and 8.6% work from home. The average trip to work takes 19.7 minutes. The unemployment rate in 2020-2024 averaged 5.6%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	Rock Island County	Illinois	Change since 2015-2019
In the labor force (age 16+)	61.2%±0.8 pts	65.0%	–
Unemployment rate	5.6%±0.8 pts	5.8%	no clear change
Drove alone to work	77.0%±1.2 pts	65.9%	–
Carpooled	9.0%±0.9 pts	7.8%	–
Public transportation	1.3%±0.4 pts	5.8%	–
Walked	2.9%±0.7 pts	2.8%	–
Worked from home	8.6%±0.7 pts	15.9%	+5.9 pts
Mean travel time to work	19.7 min±0.6	27.8 min	no clear change

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What are Rock Island County's census tracts?

Rock Island County is divided into 43 census tracts. Among those with a reliable estimate, median household income runs from $14,563 (Tract 244) to $113,083 (Tract 201.02).

All 43 census tracts of Rock Island County, with their figures

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

How does Rock Island County compare with Illinois's other counties?

Rock Island County's rank among Illinois's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	14th of 102
Growth 2020-2025	44th of 102
Residents per square mile	11th of 102
Median household income	50th of 102
Median home value	38th of 102
Median gross rent	30th of 102
Poverty rate	22nd of 102
Bachelor's degree or higher	31st of 102
Median age	77th of 102

Every county in Illinois

Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections

Not on this page: crime, weather and schools for Rock Island County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.