Randolph County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Randolph 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 average
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D
Income Well below averageLess wealthy than 88% of counties in Illinois
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F
Education Well below averageLess educated than 92% of counties in Illinois
Source: Map AI Methodology
Population: density and quick facts
| Metric | Randolph County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 30,051 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 50.3 | 219.1 | 86.4 |
| Population growth (%/yr) | -1.13% | -0.16% | 0.59% |
| Median age | 41.9 | 37.4 | 37.3 |
| Households | 11,945 | 5,035,584 | 130,235,071 |
Population in Randolph County declined by 8.5% from 2009 to 2024, reaching 30,051 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Randolph County is Gen X, aged 45–60, at 21.9% of residents. That is 1.5 points above Illinois as a whole.
- Gen Z 13–28 5,684 18.9% -2.3 pts
- Millennials 29–44 6,225 20.7% -1.2 pts
- Gen X 45–60 6,572 21.9% +1.5 pts
- Boomers 61–79 5,930 19.7% +2.8 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 44.6% of the people living in Randolph County and men 55.4%.
- Women 44.6% Illinois 50.6%
- Men 55.4% Illinois 49.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Randolph County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Randolph County has a the economy index of D, which means it is barely prosperous.
| Metric | Randolph County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $69,106 | $84,042 | $80,455 |
| Income growth (%/yr) | 4.57% | 4.46% | 4.80% |
| Unemployment rate | 5.0% | 5.8% | 5.2% |
The median household income in Randolph County is about 18% lower than in Illinois.
Housing
| Metric | Randolph County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $49,530 | $149,936 | $248,835 |
| Median rent | $779 | $1,274 | $1,407 |
| Homeownership rate | 76.6% | 67.1% | 65.2% |
The median home price in Randolph County is about 5.3 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $779 per month for that long.
Commute Time & Mobility
Commuters in Randolph County spend about 37 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 152 hours, about 6.3 full days, spent commuting.
| Metric | Randolph County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 18.3 | 23.6 | 22.4 |
| Round-trip commute (min) | 36.5 | 47.3 | 44.8 |
| Yearly time spent (hours) | 152 | 197 | 187 |
| Estimated yearly cost | $4,720 | $6,104 | $5,790 |
| Work from home | 5.3% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 9,533 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 694 | 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 Randolph County is 18 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
Randolph County has a education index of F, which means it scores poorly in education.
| Metric | Randolph County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 12.9% | 34.1% | 31.6% |
| Average household size | 2.25 | 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
Randolph County has a health index of B, which means it is quite healthy.
| Metric | Randolph County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 78.2 | 77.9 | 78.3 |
| Self-rated poor health | 16.3% | 15.6% | 16.3% |
| Smokers | 20.8% | 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).
Randolph County, IL Compared With Nearby Counties
Randolph County, IL is typical in size for this group, 30,051 residents against a local median of 35,033, so the measures below are close to a like for like comparison. Where Randolph County, IL breaks from the counties next to it is median home price, sitting 59% below the local median of $121,433 at $49,530.
The counties themselves spread $139,105 on median home price, so Randolph County, IL sits at one end of an already wide local range rather than apart from it. Randolph County, IL has the 4th highest median home price of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Randolph County, IL | 30,051 | $69,106 #3/4 | $49,530 #4/4 | 18.3 min #1/4 |
| Monroe County, IL | 35,033 | $103,327 | $208,158 | 28.2 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 Randolph County, Illinois.
How big is Randolph County, Illinois by population?
About 30,051 people live in Randolph County, Illinois, in 11,945 households of 2.3 people on average. The median age is 41.9, so residents are older than the U.S. median of 37.3 by about 5 years.
Is Randolph County, Illinois urban or rural?
Averaged over its land area, Randolph County, Illinois has 50 people per square mile, a density typical of rural areas. That is about 58% of the U.S. average of 86.
How affordable is housing in Randolph County, Illinois?
The median home costs 0.7 times the median household income ($49,530 against $69,106), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $779 a month takes about 14% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
What share of adults in Randolph County, Illinois have a college degree?
12.9% of adults in Randolph County, Illinois hold a bachelor's degree or higher (about 1 in 8), well below the U.S. share of 31.6%.
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