Village · Illinois
Onarga, Illinois
Onarga, village, in Iroquois County, Illinois. Onarga had 1,305 residents on July 1, 2025 by the Census Bureau's estimate, down 3.4% since 2020; the 2020 Census counted 1,333 and the ACS 2020-2024 5-year estimates put it at 1,430 (±224). GEOID 1756081.
Residents, July 2025 estimate
1,305
Census Bureau estimate (no margin published)
2020 Census count: 1,333 · ACS 2020-2024: 1,430 ±224
Median household income
$78,352
±$12,738 (90% margin)
Illinois: $83,390
Median home value
$99,300
±$10,268 (90% margin)
Illinois: $263,300
Median gross rent
$941
±$144 (90% margin)
Illinois: $1,274
Where is Onarga and what county is it in?
Onarga is a village in Iroquois County, Illinois. It covers 1.7 square miles of land, 796 residents per square mile in 2020.
Onarga lies entirely within Onarga Township, a township with its own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Onarga, and is it growing?
The Census Bureau estimates that 1,305 people lived in Onarga on July 1, 2025, down 3.4% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 1,333 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,430 (±224).
| Measure | Onarga | Iroquois County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,430 ±224 | 26,449 | +375 |
| Households | 535 ±73 | 11,443 | +170 |
| Average household size | 2.61 ±0.29 | 2.27 | no clear change |
| Housing units | 606 ±82 | 12,789 | +189 |
Onarga's population since 2000
From 1,438 in 2000 to 1,305 in 2025: down 9.2%. The 2000, 2010 and 2020 figures are census counts, each for Onarga as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. 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.
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); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Onarga?
The median resident of Onarga is 42.3 years old; 20.3% are under 18 and 18.7% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 60.3%, then non-Hispanic white residents at 37.6%. 33.8% of residents were born outside the United States.
| Measure | Onarga | Iroquois County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 42.3 ±3.3 | 44.4 | +6.6 |
| Under 18 years | 20.3% ±4.5 pts | 21.6% | – |
| 65 years and over | 18.7% ±4.0 pts | 22.6% | – |
| Male | 51.2% ±4.9 pts | 49.6% | – |
| Hispanic or Latino (any race) | 60.3% ±7.2 pts | 8.3% | no clear change |
| White alone, not Hispanic | 37.6% ±7.3 pts | 87.2% | no clear change |
| Black or African American alone, not Hispanic | 1.3% ±1.2 pts | 0.8% | – |
| Asian alone, not Hispanic | 0.2% ±0.3 pts | 0.3% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.4 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±2.6 pts | 0.0% | – |
| Two or more races, not Hispanic | 0.5% ±0.8 pts | 2.9% | – |
| Some other race alone, not Hispanic | 0.0% ±2.6 pts | 0.4% | – |
| Born outside the United States | 33.8% ±4.4 pts | 3.5% | +7.2 pts |
| Speak a language other than English at home (age 5+) | 54.9% ±6.9 pts | 6.0% | – |
| Civilian veterans (age 18+) | 2.6% ±2.0 pts | 6.7% | – |
| With a disability | 11.2% ±3.1 pts | 16.2% | – |
| No health insurance coverage | 13.2% ±6.3 pts | 6.0% | no clear change |
| High school graduate or higher (age 25+) | 61.6% ±7.5 pts | 89.1% | – |
| Bachelor's degree or higher (age 25+) | 8.9% ±3.6 pts | 18.2% | no clear change |
| Graduate or professional degree (age 25+) | 3.4% ±2.2 pts | 5.5% | – |
| Lived in the same house a year earlier | 92.8% ±4.6 pts | 91.7% | – |
| Moved from another state in the past year | 0.5% ±0.7 pts | 0.8% | – |
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 Onarga earn?
Half of Onarga's 535 households earn less than $78,352 a year (±$12,738), against $66,255 in Iroquois County and $83,390 in Illinois. In 2015-2019 the median was $57,393 in 2024 dollars, so it rose by $20,959 after inflation. 8.6% of residents live below the poverty line.
| Measure | Onarga | Iroquois County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $78,352 ±$12,738 | $66,255 | +$20,959 |
| Mean household income | $85,258 ±$8,583 | $84,074 | – |
| Per capita income | $31,752 ±$3,432 | $36,404 | +$7,130 |
| People below the poverty line | 8.6% ±5.6 pts | 12.5% | −13.0 pts |
| Children under 18 below the poverty line | 2.6% ±4.4 pts | 14.9% | – |
| Households receiving SNAP | 11.6% ±5.7 pts | 14.2% | – |
| Households with a computer | 83.4% ±7.3 pts | 93.3% | – |
| Households with a broadband subscription | 78.3% ±7.5 pts | 86.5% | – |
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 Onarga?
Owners occupy 88.6% of Onarga's occupied homes and renters 11.4%. The median owner-occupied home is valued at $99,300 by its owner (±$10,268). The median renter pays $941 a month including utilities.
| Measure | Onarga | Iroquois County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $99,300 ±$10,268 | $137,800 | no clear change |
| Median gross rent | $941 ±$144 | $799 | no clear change |
| Renters paying 35% or more of income on rent | 0.0% ±45.5 pts | 29.0% | – |
| Median monthly owner costs, with a mortgage | $1,095 ±$80 | $1,290 | – |
| Owner-occupied homes | 88.6% ±5.8 pts | 80.0% | no clear change |
| Renter-occupied homes | 11.4% ±5.8 pts | 20.0% | – |
| Housing units | 606 ±82 | 12,789 | +189 |
| Homeowner vacancy rate | 2.5% ±4.0 pts | 1.6% | – |
| Rental vacancy rate | 0.0% ±40.8 pts | 4.7% | – |
| Single-family detached homes | 97.9% ±1.7 pts | 85.2% | – |
| Mobile homes | 0.0% ±6.0 pts | 3.9% | – |
| Built 2020 or later | 0.0% ±6.0 pts | 0.2% | – |
| Built 2010 to 2019 | 2.5% ±2.3 pts | 2.2% | – |
| Built 1939 or earlier | 40.9% ±7.7 pts | 30.3% | – |
| Households with no vehicle | 3.2% ±1.9 pts | 4.5% | – |
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 Onarga building?
Builders took permits for 1 new housing units in Onarga in 2025 (1 in single-family houses), 0.8 per 1,000 residents against 1.5 across Illinois.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Onarga work and get to work?
79.1% of Onarga's workers drive alone. The average trip to work takes 18.5 minutes.
| Measure | Onarga | Iroquois County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 63.7% ±5.8 pts | 60.1% | – |
| Unemployment rate | 3.8% ±3.1 pts | 4.5% | – |
| Drove alone to work | 79.1% ±7.6 pts | 81.1% | – |
| Carpooled | 17.9% ±7.7 pts | 7.2% | – |
| Public transportation | 0.0% ±5.0 pts | 0.2% | – |
| Walked | 0.5% ±0.8 pts | 2.0% | – |
| Worked from home | 2.3% ±2.1 pts | 7.6% | – |
| Mean travel time to work | 18.5 min ±2.8 | 25.0 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 census tracts are in Onarga?
No census tract lies mostly in Onarga; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9506Iroquois County | 3,414 | $74,489 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Onarga) · Census block assignment files
How does Onarga compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Onarga is the 9,295th-most populous of the 19,476 U.S. incorporated places that have one and the 580th-most populous of 1,294 in Illinois.
Onarga ranks 674th of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 580th | 1,294 |
| Growth 2020-2025 (PEP) | 1,105th | 1,347 |
| Residents per square mile | 698th | 1,383 |
| Median household income | 674th | 1,380 |
| Per capita income | 1,087th | 1,383 |
| Median home value | 1,186th | 1,379 |
| Median gross rent | 666th | 1,280 |
| Poverty rate | 672nd | 1,119 |
| Bachelor's degree or higher | 1,345th | 1,369 |
| Median age | 546th | 1,383 |
| Owner-occupied share | 244th | 1,382 |
| Travel time to work | 1,223rd | 1,382 |
Onarga's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Onarga with other places
Source: PlainCities ranks computed 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 reliable are the figures for Onarga?
19 of the 57 figures for Onarga on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
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 Onarga 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' public schools in Onarga.