Iroquois County, Illinois

County in IL, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

26,449

Source: U.S. Census Bureau American Community Survey (ACS) 2020-2024 5-Year Estimates

Median Age

44.4

years ∙ half population younger than 44.4, half older

Diversity Index

23.2%

chance two random people differ in race and ethnicity

Nativity

3.5%

foreign-born population

96.5%Native

3.5% Foreign-born

Geographic Context

Location, size, and surroundings

About

Iroquois County is a county in Illinois, United States.

Location

County in IL, US

Co-ordinates

DEC40.748867° N, 87.833601° W

DMS40° 44′ 55.92″ N, 87° 50′ 00.96″ W

Population Density & area

23.68/sq mi (9.14/km²)

Total Area

1,119 sq mi (2,898 km²)

Land Area

1,117 sq mi (2,894 km²) · 99.85%

Water Area

2 sq mi (4 km²) · 0.15%

Demographics & Living

Who lives here, how households are formed, and community composition

Population Composition

Key characteristics of the population

Sex Distribution

49.6% male

Male 49.6%

Female 50.4%

males per 100 females

Iroquois County 98.5

Illinois 97.7

United States 98

Nativity

3.5%

foreign-born population

96.5%Native

3.5% Foreign-born

% Foreign-born

Iroquois County 3.5%

Illinois 14.7%

United States 14.1%

Age Distribution

How the population is spread across age groups

Median Age

44.4

years ∙ half population younger than 44.4, half older

Iroquois County

44.4

Illinois

United States

38.9

Dependency ratio

79.1

dependents per 100 working-age adults

Iroquois County 79.1

Illinois 63.5

United States 64.4

AGE DISTRIBUTION

Distribution of age group

Median age

	Iroquois County	Illinois	United States
Age Group
Children (Under 18)	21.6%	21.8%	22%
Working age (18-64)	55.8%	61.2%	60.8%
Senior (65+)	22.6%	17%	17.2%
Dependency ratio
Total dependency ratio	79.1	63.5	64.4
Child dependency ratio	38.6	35.7	36.1
Old-age dependency ratio	40.5	27.8	28.3

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

87.2%

Black

0.8%

Asian

0.3%

Hispanic

8.3%

Other

3.4%

Note: White, Black, and Asian refer to individuals belonging to a single race and not of Hispanic origin. Hispanics may be of any race.

Diversity Index

23.2%

chance two random people differ in race and ethnicity

Iroquois County 23.2%

Illinois 60.5%

United States 61.4%

Note: The Diversity Index (DI), based on the Blau Index, measures the probability that two randomly selected individuals differ in race and ethnicity. Values range from 0 (no diversity) to 1 (high diversity) and are shown as percentages.

RACIAL & ETHNIC COMPOSITION

Race & Ethnicity

Percentage of Iroquois County population

	Iroquois County	Illinois	United States
Hispanic or Latino	8.3%	18.8%	19.3%
Mexican	7.3%	14.4%	11.3%
Puerto Rican	0.2%	1.6%	1.8%
Cuban	0.1%	0.3%	0.8%
Other Hispanic / Latino	0.6%	2.5%	5.5%
Not Hispanic or Latino	91.7%	81.2%	80.7%
One race	88.8%	77.8%	76.4%
White	87.2%	58.1%	57.4%
Black or African American	0.8%	13.3%	11.9%
American Indian and Alaska Native	0.1%	0.1%	0.5%
Asian	0.3%	5.9%	5.9%
Native Hawaiian and Other Pacific Islander	0%	0%	0.2%
Some Other Race	0.4%	0.4%	0.6%
Two or more races (Multiracial)	2.9%	3.4%	4.3%

Household & Families Composition

Household size, type, and family structure

Household structure

63.4% family

Family 63.4%

Non family 36.6%

% family households

Iroquois County 63.4%

Illinois 62.2%

United States 64.2%

Average household size

2.27

persons per household

Iroquois County

2.27

Illinois

2.46

United States

2.53

Household & Family COMPOSITION

Households

Percentage of Iroquois County population

	Iroquois County	Illinois	United States
Total households	11,443	5,036,449	129,227,496
Average houshold size	2.27	2.46	2.53
Family households	7,251	3,130,978	82,990,528
Average family size	2.81	3.14	3.14
Married couple family	5,545	2,282,435	60,637,388
Other families	1,706	848,543	22,353,140
Male householder	522	248,521	6,572,819
Female householder	1,184	600,022	15,780,321
Non-family households	4,192	1,905,471	46,236,968
One-person households	3,757	1,569,881	37,140,836
Male householder	1,678	712,191	16,871,444
Senior (65+) living alone	600	210,051	5,225,110
Female householder	2,079	857,690	20,269,392
Senior (65+) living alone	1,172	417,870	10,089,070
Other living arrangements	435	335,590	9,096,132

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

12,789

housing units

Iroquois County 12,789

Illinois 5,457,452

United States 143,775,355

Occupancy status

89.5% occupied

Occupied 89.5%

Vacant 10.5%

vacancy rate

Iroquois County 10.5%

Illinois 7.7%

United States 10.1%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

87.8%

Single family houses

87.8%

Apartments in multi-unit structures

8.2%

Mobile homes

3.9%

Boat, RV, van, etc

Median Year Built

1960

Half of houses were built before 1960, and half after.

Historic ∙ 1939 or earlier

30.3%

Postwar & mid-century ∙ 1940 - 1969

30.5%

Late 20th century ∙ 1970 - 1999

30.7%

Modern ∙ 2000 or later

8.5%

Note: Median year built reflects occupied units only; distribution includes all units.

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Iroquois County	Illinois	United States
Rooms per unit
Median rooms	6.2	5.6	5.5
1–3 rooms	5.7%	14.6%	15.1%
4–6 rooms	52.2%	50.9%	51.6%
7+ rooms	42%	34.6%	33.4%
Bedrooms
No bedroom / studio	0.9%	3.1%	2.9%
1 bedroom	5.6%	11.5%	10.9%
2 bedrooms	28.4%	27.7%	25%
3 bedrooms	45.4%	35.8%	38.7%
4+ bedrooms	19.8%	21.7%	22.4%
At a glance
Median year built	1960	1971	1981
Total housing units	12,789	5,457,452	143,775,355

Occupancy Profile

Who is inside and how they use it

Homeownership

80% owners

Renter-occupied 20%

Owner-occupied 80%

homeownership rate

Iroquois County 80%

Illinois 67.1%

United States 65.2%

Average household size

2.37

Owner-occupied

1.88

Renter-occupied

owner-occupied average size

Iroquois County 2.37

Illinois 2.62

United States 2.64

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Iroquois County	Illinois	United States
Total occupied units	11,443	5,036,449	129,227,496
Year moved in
2020 or later	16.3%	23.3%	24.8%
2010 to 2019	37.2%	38.1%	39.6%
2000 to 2009	18.8%	17.3%	16.4%
1999 or earlier	27.7%	21.3%	19.1%
Occupants per room
1.00 or fewer	99.1%	97.5%	96.6%
1.01 to 1.50	0.8%	1.6%	2.2%
1.51 or more	0.1%	0.8%	1.2%
Vehicles availability
No vehicles	4.5%	11%	8.4%
1 vehicle	32.6%	35.7%	33.1%
2 vehicles	37.4%	35.1%	36.6%
3 or more vehicles	25.6%	18.3%	21.9%
House heating fuel used
Gas	79.4%	79.5%	51.4%
Electricity	18.6%	18.6%	41.3%
Solar	0%	0.1%	0.3%
Fuel oil, kerosene etc	0.5%	0.1%	3.9%
All other fuels	1.2%	0.8%	2%
No fuel used	0.3%	0.8%	1.2%
Selected characteristics
Lacking complete plumbing	0.5%	0.3%	0.4%
Lacking complete kitchen	1%	0.8%	0.8%
No telephone service available	1.1%	0.8%	0.9%

Housing Value

What owner-occupied units are worth

Median home value

$137,800

owner-occupied units

Median value(USD)

Iroquois County

$137,800

Illinois

$263,300

United States

$332,700

Housing Cost Burden

23.5%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

23.5%

Owners without a mortgage

13.5%

Renters

42.7%

Note: Households spending 30% or more of their income on housing costs are considered cost-burdened.

Financial characteristics

Property value and housing costs

Tenure, crowding, and utilities

	Iroquois County	Illinois	United States
Property value
Median Value	$137,800	$263,300	$332,700
Under $100,000	34.3%	13.7%	11.4%
$100,000 - $200,000	35.4%	21.5%	15.8%
$200,000 - $300,000	17.9%	22.3%	17.8%
$300,000 - $500,000	8.7%	27.7%	26.9%
$500,000 - $1,000,000	2.5%	12.1%	20.9%
$1,000,000 and more	1.3%	2.7%	7.1%
Owner-occupied households
With a mortgage	49.6%	60.8%	60.6%
Without a mortgage	50.4%	39.2%	39.4%
Median monthly owner costs
With a mortgage	$1,290	$1,987	$1,963
Without a mortgage	$576	$792	$638
Gross rent
Median rent	$799	$1,274	$1,413

Education Profile

How educated is the community and how education pays off

Adults with a college degree

18.2%

of adults 25+ with a bachelor's degree or higher

Iroquois County 18.2%

Illinois 37.8%

United States 35.7%

Adults without a high school diploma

10.9%

of adults (25+) without a high school diploma

Iroquois County 10.9%

Illinois 9.6%

United States 10.4%

School Enrollment

Who is enrolled in school and at what level

School enrollment

5,271

population (age 3+) enrolled in school

Nursery / Preschool

K–12

78.9%

College / Undergraduate

10.3%

Graduate / Professional

2.8%

College-going rate (18-24 yr olds)

15.1%

of 18-24-year-olds in college or graduate school

Iroquois County

15.1%

Illinois

41.4%

United States

40.9%

Enrollment & school type

Enrollment levels, college-going rate, and public vs private school split

Population 3+ currently enrolled in a school

	Iroquois County	Illinois	United States
Total enrolled (age 3+)	5,271	3,051,569	80,089,790
Nursery / preschool	8%	6.3%	5.7%
K–12	78.9%	67.3%	67.6%
Kindergarten	6.5%	4.9%	5%
Elementary: Grades 1–4	22.2%	19.5%	19.8%
Elementary: Grades 5–8	22.8%	20.8%	21%
High School: Grades 9–12	27.5%	22.1%	21.7%
College or graduate school	13.1%	26.4%	26.7%
College, undergraduate	10.3%	19.8%	21%
Graduate, professional school	2.8%	6.6%	5.8%
College-going rate · 18-24 yr olds	15.1%	41.4%	40.9%
School type
Public school	86.5%	80.5%	82%
Private school	13.5%	19.5%	18%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

18,700

population 25 years and over

Total adults (25+)

Less than 9th grade

3.7%

9th-12th, no diploma

7.2%

HS graduate

37.4%

Some college no degree

23.4%

Associates degree

10.1%

Bachelors degree

12.7%

Graduate or professional degree

5.5%

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

55.7% · 44.3%

9th-12th, no diploma

54.7% · 45.3%

HS graduate

52.3% · 47.7%

Some college no degree

46.8% · 53.2%

Associates degree

44.2% · 55.8%

Bachelors degree

47.8% · 52.2%

Graduate or professional degree

31.3% · 68.7%

Educational Attainment Overview

Distribution and key education attainment rates for adults (25+)

Highest credential completed · adults 25+

	Iroquois County	Illinois	United States
Population (25+)	18,700	8,767,004	230,807,303
Less than 9th grade	3.7%	4.6%	4.7%
9th–12th, no diploma	7.2%	5%	5.7%
High school diploma or GED	37.4%	25.1%	26%
Some college, no degree	23.4%	19.2%	19.1%
Associate's degree	10.1%	8.3%	8.8%
Bachelor's degree or higher	18.2%	37.8%	35.7%
Bachelor's degree	12.7%	22.6%	21.6%
Graduate or professional	5.5%	15.3%	14.1%
High School or higher	89.1%	90.5%	89.6%

Earnings by education level

percentage as applicable

Median Earnings

$46,608

Median earnings for adults 25+, by level

Less than HS graduate

$34,356

HS graduate

$42,966

Some college or associates

$46,611

Bachelors degree

$60,000

Graduate or professional degree

$56,414

Poverty Rate

3.6%

for ages 25+, with bachelors degree or higher

Less than HS graduate

23.9%

HS graduate

12.4%

Some college or associates

10.6%

Bachelors degree or higher

3.6%

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Iroquois County	Illinois	United States
Median earnings
Population 25+, with earnings	$46,608	$55,582	$52,696
Less than high school graduate	$34,356	$34,655	$32,485
High school graduate (includes equivalency)	$42,966	$40,965	$40,153
Some college or associate's degree	$46,611	$47,813	$47,260
Bachelor's degree	$60,000	$73,326	$70,044
Graduate or professional degree	$56,414	$91,623	$90,720
Poverty rates
Less than high school graduate	23.9%	21.6%	24.2%
High school graduate (includes equivalency)	12.4%	14.4%	14.4%
Some college or associate's degree	10.6%	9.9%	9.8%
Bachelor's degree or higher	3.6%	4.5%	4.5%

Insights for Iroquois County, by topic

Income By year By race By age By gender

Population By year By race By age By gender

About Neilsberg Research

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