Iroquois County, Illinois Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 51st-largest in Illinois

The population of Iroquois County, Illinois is 26,746 as of the 2023 American Community Survey, making it the 51st-largest county in Illinois. The median household income is $62,439, the median home value is $125,400, and the median age is 44.4.

The population of Iroquois County has declined 12.2% since 2010 (29,701 → 26,067), a -0.93% annualized rate.

Iroquois County within Illinois · Source: US Census TIGER/Line via us-atlas

26,746

Population

-0.93%

Annual growth

People / sq mi

$62,439

Median Income

$125,400

Median Home Value

Iroquois County covers 1,117 sq mi of land at 23.9 people per square mile.

About Iroquois County, IL

Iroquois County is distinguished by its share of foreign-born residents, 14.1% of the population. Iroquois County is a county in Illinois with a population of 26,746.

Household earnings are middling, with a median of $62,439 — below the US median of $78,538. Poverty runs at 9.2%, below the national 12.4%. Housing is relatively affordable, with a median home value of $125,400, with typical rent around $793.

College attainment is 16.7%, below the national 35.0%. Around 7.2% of workers work from home, below the national 14.0%, and the average commute runs about 24 minutes each way.

Iroquois County Population History (2010-2024)

The county of Iroquois County had a population of 29,701 in 2010 and 26,067 in 2024, a -12.2% growth over 14 years. The peak was 29,701 in 2010. Average annual growth rate: -0.93%.

Iroquois County population, 2010–2024 · Source: U.S. Census Bureau — decennial census & Population Estimates

26,067

Population (2024)

29,701

Population (2010)

29,701

Peak (2010)

-0.93%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	29,701	-	-	estimate
2011	29,501	-200	-0.67%	estimate
2012	29,270	-231	-0.78%	estimate
2013	28,943	-327	-1.12%	estimate
2014	28,725	-218	-0.75%	estimate
2015	28,529	-196	-0.68%	estimate
2016	28,150	-379	-1.33%	estimate
2017	27,780	-370	-1.31%	estimate
2018	27,450	-330	-1.19%	estimate
2019	27,093	-357	-1.30%	estimate
2020	26,966	-127	-0.47%	estimate
2021	26,761	-205	-0.76%	estimate
2022	26,417	-344	-1.29%	estimate
2023	26,033	-384	-1.45%	estimate
2024	26,067	+34	+0.13%	estimate

Race & Ethnicity

White	89.6%
Black or African American	0.7%
Asian	0.0%
Hispanic or Latino (any race)	1.1%
Two or More Races	0.0%

Age & Sex

44.4

Median Age

50.6%

Female

49.4%

Male

22.2%

Age 65+

Age Distribution

Under 5

5.7%

5–9

5.9%

10–14

5.8%

15–19

6.3%

20–24

5.6%

25–34

9.9%

35–44

11.6%

45–54

11.7%

55–59

6.5%

60–64

8.7%

65–74

12.5%

75–84

7.1%

85+

2.6%

Children (under 15): 17.4% · Seniors (65+): 22.2%

Income & Poverty

Median household income	$62,439$-19,263 vs state
Mean household income	$81,382
Per-capita income	$34,719
Poverty rate	9.2%+1.0% vs state
Unemployment rate	2.8%
Employment-to-population	56.0%

Top Industries by Employment

Professional & business services

23.6%

Manufacturing

12.1%

Construction

8.0%

Agriculture

7.8%

Retail trade

6.1%

Information

5.5%

Finance & real estate

5.2%

Arts, entertainment & food

5.1%

The largest employment sector in Iroquois County is professional & business services, accounting for 23.6% of workers.

How residents commute

0.3%

Drive alone

2.1%

Carpool

81.1%

Public transit

7.2%

Work from home

24.1 min

Avg commute

Housing

$125,400$-125,100 vs state

Median home value

$793

Median rent

78.5%

Homeownership rate

12,818

Total housing units

88.4%

Occupied

11.6%

Vacant

21.5%

Renter-occupied

Social & access

93.7%

With health insurance

91.7%

With broadband internet

14.1%

Foreign-born

7.0%

Veterans (18+)

17.0%

With a disability

94.0%

Speak language other than English at home

Education

89.1%

High School+

16.7%

Bachelor's+

Largest cities in Illinois

Chicago (2,707,648)Aurora (179,867)Joliet (149,785)Naperville (149,424)Rockford (147,649)Elgin (114,106)Springfield (113,714)Peoria (112,126)Waukegan (88,919)Champaign (88,822)All Illinois cities →

Other counties in Illinois

Cook County (5,185,812)DuPage County (927,263)Lake County (711,885)Will County (698,450)Kane County (516,097)McHenry County (311,366)Winnebago County (283,289)Madison County (264,631)St. Clair County (254,777)Champaign County (206,098)All Illinois counties →

Part of Illinois

Illinois demographic profile All Illinois data →

Metro areas in Illinois

Chicago (9,359,555)St. Louis (2,809,414)Davenport (381,864)Peoria (365,773)Rockford (336,605)Champaign (236,196)Springfield (207,386)Bloomington (170,882)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All rankings →

Frequently Asked Questions

Iroquois County, Illinois has a population of 26,746 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 51st-largest county in Illinois. Population density is 24 people per square mile.

The population of Iroquois County has declined 12.2% since 2010 (29,701 → 26,067), a -0.93% annualized rate.

The median household income in Iroquois County, Illinois is $62,439, with mean (average) household income of $81,382 and per-capita income of $34,719. 9.2% of residents live below the federal poverty level.

In Iroquois County, the largest racial and ethnic groups are White (89.6%), Hispanic or Latino (1.1%), Black or African American (0.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.

The median age in Iroquois County, Illinois is 44.4 years. Residents are 50.6% female and 49.4% male.

The median home value in Iroquois County is $125,400 and median monthly rent is $793. 78.5% of occupied housing units are owner-occupied. The county has 12,818 total housing units, 11.6% of which are vacant.

The largest employment sector in Iroquois County, Illinois is professional, scientific, and management services, employing 23.6% of workers. The unemployment rate is 2.8%.

Chicago is among the largest cities associated with Iroquois County, Illinois, with a population of 2,707,648.