Clinton County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Clinton 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.
-
B
Health Around averageHealthier than 88% of counties in Illinois
-
B
Income Around averageWealthier than 85% of counties in Illinois
-
D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | Clinton County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 36,954 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 73.4 | 219.1 | 86.4 |
| Population growth (%/yr) | -0.30% | -0.16% | 0.59% |
| Median age | 42.5 | 37.4 | 37.3 |
| Households | 14,570 | 5,035,584 | 130,235,071 |
Population in Clinton County grew by 2.0% from 2009 to 2024, reaching 36,954 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Clinton County is Gen X, aged 45–60, at 22.5% of residents. That is 2.1 points above Illinois as a whole.
- Gen Z 13–28 6,716 18.2% -3.1 pts
- Millennials 29–44 7,829 21.2% -0.7 pts
- Gen X 45–60 8,316 22.5% +2.1 pts
- Boomers 61–79 6,780 18.3% +1.4 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 48.2% of the people living in Clinton County and men 51.8%.
- Women 48.2% Illinois 50.6%
- Men 51.8% Illinois 49.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Clinton County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Clinton County has a the economy index of B, which means it is quite prosperous.
| Metric | Clinton County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $86,530 | $84,042 | $80,455 |
| Income growth (%/yr) | 3.69% | 4.46% | 4.80% |
| Unemployment rate | 3.4% | 5.8% | 5.2% |
The median household income in Clinton County is about 3% higher than in Illinois.
Housing
| Metric | Clinton County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $64,999 | $149,936 | $248,835 |
| Median rent | $912 | $1,274 | $1,407 |
| Homeownership rate | 80.3% | 67.1% | 65.2% |
The median home price in Clinton County is about 5.9 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $912 per month for that long.
Commute Time & Mobility
Commuters in Clinton County spend about 44 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 181 hours, about 7.6 full days, spent commuting.
| Metric | Clinton County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 21.8 | 23.6 | 22.4 |
| Round-trip commute (min) | 43.5 | 47.3 | 44.8 |
| Yearly time spent (hours) | 181 | 197 | 187 |
| Estimated yearly cost | $5,621 | $6,104 | $5,790 |
| Work from home | 12.6% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 5,269 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 738 | 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 Clinton County is 22 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
Clinton County has a education index of D, which means it is barely educated.
| Metric | Clinton County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 22.5% | 34.1% | 31.6% |
| Average household size | 2.39 | 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
Clinton County has a health index of B, which means it is quite healthy.
| Metric | Clinton County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 79.8 | 77.9 | 78.3 |
| Self-rated poor health | 13.4% | 15.6% | 16.3% |
| Smokers | 18.2% | 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).
Clinton County, IL Compared With Nearby Counties
Clinton County, IL is typical in size for this group, 36,954 residents against a local median of 37,000, so the measures below are close to a like for like comparison. Clinton County, IL's median household income, at $86,530, runs 37% above the $63,094 typical of the counties around it. That is the better end of the local range on this measure.
The counties themselves spread $12,760 on median household income, so Clinton County, IL sits at one end of an already wide local range rather than apart from it. Clinton County, IL has the highest median household income of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Clinton County, IL | 36,954 | $86,530 #1/4 | $64,999 #3/4 | 21.8 min #4/4 |
| Marion County, IL | 37,000 | $61,117 | $27,338 | 16.6 min |
| St. Clair County, IL | 253,661 | $73,876 | $121,433 | 21.4 min |
| Perry County, IL | 20,638 | $63,094 | $69,053 | 20.6 min |
Frequently Asked Questions
Common questions about Clinton County, Illinois.
How many people live in Clinton County, Illinois?
About 36,954 people live in Clinton County, Illinois, in 14,570 households of 2.4 people on average. The median age is 42.5, so residents are older than the U.S. median of 37.3 by about 5 years.
Is Clinton County, Illinois urban or rural?
Averaged over its land area, Clinton County, Illinois has 73 people per square mile, a density typical of rural areas. That is close to the U.S. average of 86.
Can a typical household afford a home in Clinton County, Illinois?
The median home costs 0.8 times the median household income ($64,999 against $86,530), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $912 a month takes about 13% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
Is it hard to find a job in Clinton County, Illinois?
Unemployment in Clinton County, Illinois is only 3.4%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
What share of adults in Clinton County, Illinois have a college degree?
22.5% of adults in Clinton County, Illinois hold a bachelor's degree or higher (about 1 in 4), well below the U.S. share of 31.6%.
Analyze any area in the US
Get local demographics for any address, aggregated by drive time or radius, on the interactive map.
Explore the map →