Onarga, IL

Village in Iroquois County, IL, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

1,430

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

Median Age

42.3

years ∙ half population younger than 42.3, half older

Diversity Index

49.5%

chance two random people differ in race and ethnicity

Nativity

33.8%

foreign-born population

66.2%Native

33.8% Foreign-born

Geographic Context

Location, size, and surroundings

About

Onarga is a village within Iroquois County, Illinois, United States.

Location

Village in Iroquois County, IL, US

Co-ordinates

DEC40.715308° N, 88.010822° W

DMS40° 42′ 55.11″ N, 88° 00′ 38.96″ W

Population Density & area

856.3/sq mi (329.5/km²)

Total Area

1.67 sq mi (4.34 km²)

Land Area

1.67 sq mi (4.34 km²) · 100%

Water Area

0 sq mi (0 km²) · 0%

Demographics & Living

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

Population Composition

Key characteristics of the population

Sex Distribution

51.2% male

Male 51.2%

Female 48.8%

males per 100 females

Onarga 104.9

Iroquois County 98.5

Illinois 97.7

Nativity

33.8%

foreign-born population

66.2%Native

33.8% Foreign-born

% Foreign-born

Onarga 33.8%

Iroquois County 3.5%

Illinois 14.7%

Age Distribution

How the population is spread across age groups

Median Age

42.3

years ∙ half population younger than 42.3, half older

Onarga

42.3

Iroquois County

44.4

Illinois

Dependency ratio

dependents per 100 working-age adults

Onarga 64

Iroquois County 79.1

Illinois 63.5

AGE DISTRIBUTION

Distribution of age group

Median age

	Onarga	Iroquois County	Illinois
Age Group
Children (Under 18)	20.3%	21.6%	21.8%
Working age (18-64)	61%	55.8%	61.2%
Senior (65+)	18.7%	22.6%	17%
Dependency ratio
Total dependency ratio	64	79.1	63.5
Child dependency ratio	33.4	38.6	35.7
Old-age dependency ratio	30.6	40.5	27.8

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

37.6%

Black

1.3%

Asian

0.2%

Hispanic

60.3%

Other

0.6%

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

49.5%

chance two random people differ in race and ethnicity

Onarga 49.5%

Iroquois County 23.2%

Illinois 60.5%

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 Onarga population

	Onarga	Iroquois County	Illinois
Hispanic or Latino	60.3%	8.3%	18.8%
Mexican	59.2%	7.3%	14.4%
Puerto Rican	0.1%	0.2%	1.6%
Cuban	0%	0.1%	0.3%
Other Hispanic / Latino	1%	0.6%	2.5%
Not Hispanic or Latino	39.7%	91.7%	81.2%
One race	39.2%	88.8%	77.8%
White	37.6%	87.2%	58.1%
Black or African American	1.3%	0.8%	13.3%
American Indian and Alaska Native	0.2%	0.1%	0.1%
Asian	0.2%	0.3%	5.9%
Native Hawaiian and Other Pacific Islander	0%	0%	0%
Some Other Race	0%	0.4%	0.4%
Two or more races (Multiracial)	0.5%	2.9%	3.4%

Household & Families Composition

Household size, type, and family structure

Household structure

69.7% family

Family 69.7%

Non family 30.3%

% family households

Onarga 69.7%

Iroquois County 63.4%

Illinois 62.2%

Average household size

2.61

persons per household

Onarga

2.61

Iroquois County

2.27

Illinois

2.46

Household & Family COMPOSITION

Households

Percentage of Onarga population

	Onarga	Iroquois County	Illinois
Total households	535	11,443	5,036,449
Average houshold size	2.61	2.27	2.46
Family households	373	7,251	3,130,978
Average family size	3.23	2.81	3.14
Married couple family	303	5,545	2,282,435
Other families	70	1,706	848,543
Male householder	42	522	248,521
Female householder	28	1,184	600,022
Non-family households	162	4,192	1,905,471
One-person households	147	3,757	1,569,881
Male householder	39	1,678	712,191
Senior (65+) living alone	12	600	210,051
Female householder	108	2,079	857,690
Senior (65+) living alone	84	1,172	417,870
Other living arrangements	15	435	335,590

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

606

housing units

Onarga 606

Iroquois County 12,789

Illinois 5,457,452

Occupancy status

88.3% occupied

Occupied 88.3%

Vacant 11.7%

vacancy rate

Onarga 11.7%

Iroquois County 10.5%

Illinois 7.7%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

97.9%

Single family houses

97.9%

Apartments in multi-unit structures

2.2%

Mobile homes

Boat, RV, van, etc

Median Year Built

1956

Half of houses were built before 1956, and half after.

Historic ∙ 1939 or earlier

40.9%

Postwar & mid-century ∙ 1940 - 1969

30.4%

Late 20th century ∙ 1970 - 1999

18.1%

Modern ∙ 2000 or later

10.6%

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

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Onarga	Iroquois County	Illinois
Rooms per unit
Median rooms	6.1	6.2	5.6
1–3 rooms	3%	5.7%	14.6%
4–6 rooms	56%	52.2%	50.9%
7+ rooms	41.1%	42%	34.6%
Bedrooms
No bedroom / studio	0%	0.9%	3.1%
1 bedroom	3%	5.6%	11.5%
2 bedrooms	25.6%	28.4%	27.7%
3 bedrooms	43.9%	45.4%	35.8%
4+ bedrooms	27.6%	19.8%	21.7%
At a glance
Median year built	1956	1960	1971
Total housing units	606	12,789	5,457,452

Occupancy Profile

Who is inside and how they use it

Homeownership

88.6% owners

Renter-occupied 11.4%

Owner-occupied 88.6%

homeownership rate

Onarga 88.6%

Iroquois County 80%

Illinois 67.1%

Average household size

2.63

Owner-occupied

2.46

Renter-occupied

owner-occupied average size

Onarga 2.63

Iroquois County 2.37

Illinois 2.62

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Onarga	Iroquois County	Illinois
Total occupied units	535	11,443	5,036,449
Year moved in
2020 or later	14.6%	16.3%	23.3%
2010 to 2019	27.7%	37.2%	38.1%
2000 to 2009	33.5%	18.8%	17.3%
1999 or earlier	24.3%	27.7%	21.3%
Occupants per room
1.00 or fewer	96.8%	99.1%	97.5%
1.01 to 1.50	3.2%	0.8%	1.6%
1.51 or more	0%	0.1%	0.8%
Vehicles availability
No vehicles	3.2%	4.5%	11%
1 vehicle	26.2%	32.6%	35.7%
2 vehicles	24.5%	37.4%	35.1%
3 or more vehicles	46.2%	25.6%	18.3%
House heating fuel used
Gas	92.5%	79.4%	79.5%
Electricity	7.5%	18.6%	18.6%
Solar	0%	0%	0.1%
Fuel oil, kerosene etc	0%	0.5%	0.1%
All other fuels	0%	1.2%	0.8%
No fuel used	0%	0.3%	0.8%
Selected characteristics
Lacking complete plumbing	7.1%	0.5%	0.3%
Lacking complete kitchen	3.6%	1%	0.8%
No telephone service available	7.7%	1.1%	0.8%

Housing Value

What owner-occupied units are worth

Median home value

$99,300

owner-occupied units

Median value(USD)

Onarga

$99,300

Iroquois County

$137,800

Illinois

$263,300

Housing Cost Burden

14.5%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

14.5%

Owners without a mortgage

8.4%

Renters

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

	Onarga	Iroquois County	Illinois
Property value
Median Value	$99,300	$137,800	$263,300
Under $100,000	50.6%	34.3%	13.7%
$100,000 - $200,000	31%	35.4%	21.5%
$200,000 - $300,000	11.8%	17.9%	22.3%
$300,000 - $500,000	4%	8.7%	27.7%
$500,000 - $1,000,000	2.5%	2.5%	12.1%
$1,000,000 and more	0%	1.3%	2.7%
Owner-occupied households
With a mortgage	34.8%	49.6%	60.8%
Without a mortgage	65.2%	50.4%	39.2%
Median monthly owner costs
With a mortgage	$1,095	$1,290	$1,987
Without a mortgage	$507	$576	$792
Gross rent
Median rent	$941	$799	$1,274

Education Profile

How educated is the community and how education pays off

Adults with a college degree

8.9%

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

Onarga 8.9%

Iroquois County 18.2%

Illinois 37.8%

Adults without a high school diploma

38.4%

of adults (25+) without a high school diploma

Onarga 38.4%

Iroquois County 10.9%

Illinois 9.6%

School Enrollment

Who is enrolled in school and at what level

School enrollment

337

population (age 3+) enrolled in school

Nursery / Preschool

6.8%

K–12

80.1%

College / Undergraduate

13.1%

Graduate / Professional

College-going rate (18-24 yr olds)

14.6%

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

Onarga

14.6%

Iroquois County

15.1%

Illinois

41.4%

Enrollment & school type

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

Population 3+ currently enrolled in a school

	Onarga	Iroquois County	Illinois
Total enrolled (age 3+)	337	5,271	3,051,569
Nursery / preschool	6.8%	8%	6.3%
K–12	80.1%	78.9%	67.3%
Kindergarten	0%	6.5%	4.9%
Elementary: Grades 1–4	16.3%	22.2%	19.5%
Elementary: Grades 5–8	19%	22.8%	20.8%
High School: Grades 9–12	44.8%	27.5%	22.1%
College or graduate school	13.1%	13.1%	26.4%
College, undergraduate	13.1%	10.3%	19.8%
Graduate, professional school	0%	2.8%	6.6%
College-going rate · 18-24 yr olds	14.6%	15.1%	41.4%
School type
Public school	90.2%	86.5%	80.5%
Private school	9.8%	13.5%	19.5%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

940

population 25 years and over

Total adults (25+)

Less than 9th grade

28.9%

9th-12th, no diploma

9.5%

HS graduate

34.4%

Some college no degree

12%

Associates degree

6.3%

Bachelors degree

5.5%

Graduate or professional degree

3.4%

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

58.5% · 41.5%

9th-12th, no diploma

60.7% · 39.3%

HS graduate

58.8% · 41.2%

Some college no degree

32.7% · 67.3%

Associates degree

0% · 100%

Bachelors degree

36.5% · 63.5%

Graduate or professional degree

40.6% · 59.4%

Educational Attainment Overview

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

Highest credential completed · adults 25+

	Onarga	Iroquois County	Illinois
Population (25+)	940	18,700	8,767,004
Less than 9th grade	28.9%	3.7%	4.6%
9th–12th, no diploma	9.5%	7.2%	5%
High school diploma or GED	34.4%	37.4%	25.1%
Some college, no degree	12%	23.4%	19.2%
Associate's degree	6.3%	10.1%	8.3%
Bachelor's degree or higher	8.9%	18.2%	37.8%
Bachelor's degree	5.5%	12.7%	22.6%
Graduate or professional	3.4%	5.5%	15.3%
High School or higher	61.6%	89.1%	90.5%

Earnings by education level

percentage as applicable

Median Earnings

$47,716

Median earnings for adults 25+, by level

Less than HS graduate

$48,832

HS graduate

$37,282

Some college or associates

$46,172

Bachelors degree

$48,250

Graduate or professional degree

$53,906

Poverty Rate

for ages 25+, with bachelors degree or higher

Less than HS graduate

10%

HS graduate

6.2%

Some college or associates

16.9%

Bachelors degree or higher

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Onarga	Iroquois County	Illinois
Median earnings
Population 25+, with earnings	$47,716	$46,608	$55,582
Less than high school graduate	$48,832	$34,356	$34,655
High school graduate (includes equivalency)	$37,282	$42,966	$40,965
Some college or associate's degree	$46,172	$46,611	$47,813
Bachelor's degree	$48,250	$60,000	$73,326
Graduate or professional degree	$53,906	$56,414	$91,623
Poverty rates
Less than high school graduate	10%	23.9%	21.6%
High school graduate (includes equivalency)	6.2%	12.4%	14.4%
Some college or associate's degree	16.9%	10.6%	9.9%
Bachelor's degree or higher	0%	3.6%	4.5%

Insights for Onarga, 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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