Warren County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Warren County, IL Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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B
Health Around averageHealthier than 76% of counties in Illinois
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C
Income Below average
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D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | Warren County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 16,447 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 30.3 | 219.1 | 86.4 |
| Population growth (%/yr) | -0.85% | -0.16% | 0.59% |
| Median age | 37.6 | 37.4 | 37.3 |
| Households | 6,787 | 5,035,584 | 130,235,071 |
Population in Warren County declined by 6.3% from 2009 to 2024, reaching 16,447 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Warren County is Gen Z, aged 13–28, at 22.8% of residents. That is 1.6 points above Illinois as a whole.
- Gen Z 13–28 3,756 22.8% +1.6 pts
- Millennials 29–44 2,891 17.6% -4.3 pts
- Gen X 45–60 3,281 19.9% -0.4 pts
- Boomers 61–79 3,048 18.5% +1.6 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Illinois, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 51.1% of the people living in Warren County and men 48.9%.
- Women 51.1% Illinois 50.6%
- Men 48.9% Illinois 49.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Warren County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Warren County has a the economy index of C, which means it is somewhat prosperous.
| Metric | Warren County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $68,384 | $84,042 | $80,455 |
| Income growth (%/yr) | 5.67% | 4.46% | 4.80% |
| Unemployment rate | 3.6% | 5.8% | 5.2% |
The median household income in Warren County is about 19% lower than in Illinois.
Housing
| Metric | Warren County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $22,386 | $149,936 | $248,835 |
| Median rent | $787 | $1,274 | $1,407 |
| Homeownership rate | 75.2% | 67.1% | 65.2% |
The median home price in Warren County is about 2.4 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $787 per month for that long.
Commute Time & Mobility
Commuters in Warren County spend about 27 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 114 hours, about 4.7 full days, spent commuting.
| Metric | Warren County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 13.6 | 23.6 | 22.4 |
| Round-trip commute (min) | 27.3 | 47.3 | 44.8 |
| Yearly time spent (hours) | 114 | 197 | 187 |
| Estimated yearly cost | $3,522 | $6,104 | $5,790 |
| Work from home | 7.4% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 2,990 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 407 | 1,547 | 1,355 |
Fastest commutes among counties in
Illinois:
Edgar County (12.0 min), Brown County (12.7 min), Morgan County (13.1 min).
Slowest:
Calhoun County (43.8 min), Pulaski County (31.2 min), Pope County (31.0 min).
The average commute time in Warren County is 14 minutes, shorter than the 24 minutes in Illinois.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Warren County has a education index of D, which means it is barely educated.
| Metric | Warren County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 19.1% | 34.1% | 31.6% |
| Average household size | 2.27 | 2.46 | 2.53 |
Highest education index among counties in
Illinois:
DuPage County (0.4), Champaign County (0.4), Lake County (0.4).
Lowest:
Hardin County (0.2), Fayette County (0.2), Perry County (0.2).
Health
Warren County has a health index of B, which means it is quite healthy.
| Metric | Warren County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 79.2 | 77.9 | 78.3 |
| Self-rated poor health | 14.7% | 15.6% | 16.3% |
| Smokers | 17.8% | 19.2% | 19.0% |
Highest health index among counties in
Illinois:
DuPage County (0.8), Champaign County (0.8), Monroe County (0.8).
Lowest:
Alexander County (0.8), Pulaski County (0.8), Gallatin County (0.8).
Warren County, IL Compared With Nearby Counties
Warren County, IL is the smallest of the 4 counties compared here, 16,447 residents against a local median of 33,018. Warren County, IL's median home price, at $22,386, runs 70% below the $74,502 typical of the counties around it.
Median household income tells the same story from another angle: $68,384 against a local median of $57,634, 19% above it. The one measure here that carries a verdict is median household income, and at 19% above the local median it puts Warren County, IL at the better end of the local range. The counties themselves spread $62,049 on median home price, so Warren County, IL sits at one end of an already wide local range rather than apart from it. Warren County, IL has the 4th highest median home price of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Warren County, IL | 16,447 | $68,384 #1/4 | $22,386 #4/4 | 13.6 min #2/4 |
| McDonough County, IL | 26,917 | $54,356 | $90,788 | 13.1 min |
| Knox County, IL | 49,044 | $57,634 | $28,739 | 14.0 min |
| Fulton County, IL | 33,018 | $60,876 | $74,502 | 18.8 min |
Frequently Asked Questions
Common questions about Warren County, Illinois.
How big is Warren County, Illinois by population?
About 16,447 people live in Warren County, Illinois, in 6,787 households of 2.3 people on average. The median age is 37.6, close to the U.S. median of 37.3.
Is Warren County, Illinois urban or rural?
Averaged over its land area, Warren County, Illinois has 30 people per square mile, a density typical of rural areas. That is about 35% of the U.S. average of 86.
Can a typical household afford a home in Warren County, Illinois?
The median home costs 0.3 times the median household income ($22,386 against $68,384), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $787 a month takes about 14% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
Is unemployment high in Warren County, Illinois?
Unemployment in Warren County, Illinois is only 3.6%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
How common is a college degree in Warren County, Illinois?
19.1% of adults in Warren County, Illinois hold a bachelor's degree or higher (about 1 in 5), well below the U.S. share of 31.6%.
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