Cass County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Cass 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 averageLess healthy than 78% of counties in Illinois
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C
Income Below average
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F
Education Well below averageLess educated than 95% of counties in Illinois
Source: Map AI Methodology
Population: density and quick facts
| Metric | Cass County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 12,785 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 33.3 | 219.1 | 86.4 |
| Population growth (%/yr) | -0.25% | -0.16% | 0.59% |
| Median age | 36.5 | 37.4 | 37.3 |
| Households | 5,128 | 5,035,584 | 130,235,071 |
Population in Cass County declined by 5.9% from 2009 to 2024, reaching 12,785 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Cass County is Millennials, aged 29–44, at 20.8% of residents. That is 1.1 points below Illinois as a whole.
- Gen Z 13–28 2,535 19.8% -1.4 pts
- Millennials 29–44 2,656 20.8% -1.1 pts
- Gen X 45–60 2,588 20.2% -0.1 pts
- Boomers 61–79 2,193 17.2% +0.2 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 50.2% of the people living in Cass County and men 49.8%.
- Women 50.2% Illinois 50.6%
- Men 49.8% Illinois 49.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Cass County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Cass County has a the economy index of C, which means it is somewhat prosperous.
| Metric | Cass County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $67,734 | $84,042 | $80,455 |
| Income growth (%/yr) | 4.21% | 4.46% | 4.80% |
| Unemployment rate | 4.2% | 5.8% | 5.2% |
The median household income in Cass County is about 19% lower than in Illinois.
Housing
| Metric | Cass County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $68,886 | $149,936 | $248,835 |
| Median rent | $723 | $1,274 | $1,407 |
| Homeownership rate | 75.9% | 67.1% | 65.2% |
The median home price in Cass County is about 7.9 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $723 per month for that long.
Commute Time & Mobility
Commuters in Cass County spend about 31 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 130 hours, about 5.4 full days, spent commuting.
| Metric | Cass County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 15.6 | 23.6 | 22.4 |
| Round-trip commute (min) | 31.3 | 47.3 | 44.8 |
| Yearly time spent (hours) | 130 | 197 | 187 |
| Estimated yearly cost | $4,039 | $6,104 | $5,790 |
| Work from home | 5.7% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 1,720 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 533 | 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 Cass County is 16 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
Cass County has a education index of F, which means it scores poorly in education.
| Metric | Cass County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 17.6% | 34.1% | 31.6% |
| Average household size | 2.46 | 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
Cass County has a health index of B, which means it is quite healthy.
| Metric | Cass County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 76.8 | 77.9 | 78.3 |
| Self-rated poor health | 17.4% | 15.6% | 16.3% |
| Smokers | 20.5% | 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).
Cass County, IL Compared With Nearby Counties
How Cass County, IL compares with the 1 counties closest to it.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Cass County, IL | 12,785 | $67,734 #1/2 | $68,886 #2/2 | 15.6 min #2/2 |
| Morgan County, IL | 33,021 | $65,762 | $93,502 | 13.1 min |
Frequently Asked Questions
Common questions about Cass County, Illinois.
What is the population of Cass County, Illinois?
About 12,785 people live in Cass County, Illinois, in 5,128 households of 2.5 people on average. The median age is 36.5, close to the U.S. median of 37.3.
Is Cass County, Illinois mostly urban or rural?
Averaged over its land area, Cass County, Illinois has 33 people per square mile, a density typical of rural areas. That is about 39% of the U.S. average of 86.
Can a typical household afford a home in Cass County, Illinois?
The median home costs 1.0 times the median household income ($68,886 against $67,734), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $723 a month takes about 13% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
What share of adults in Cass County, Illinois have a college degree?
17.6% of adults in Cass County, Illinois hold a bachelor's degree or higher (about 1 in 6), well below the U.S. share of 31.6%.
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