Johnson County, IL Population Statistics: Density Map Data
Analyze local population trends, population density map, housing costs, and the local economy.
Area Snapshot Statistics
Key statistics on population, economy, housing, and commuting compared to state and national averages. Explore interactive maps for deeper analysis.
Population: density and quick facts
| Metric | Johnson County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 12,794 | 12,497,595 | 334,821,731 |
| Population density (per sq mi) | 36.7 | 215.8 | 85.8 |
| Population growth (%/yr) | 0.52% | -0.18% | 0.57% |
| Median age | 41.2 | 37.3 | 37.1 |
| Households | 4,133 | 5,000,691 | 128,459,983 |
Population in Johnson County declined by 2.7% from 2009 to 2023, reaching 13,346 in 2023.
Population Growth 2009–2023
Race & Ethnicity
Economy
Johnson County has a the economy index of D, which means it is barely prosperous.
| Metric | Johnson County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $64,254 | $82,179 | $78,145 |
| Income growth (%/yr) | 5.57% | 4.78% | 5.07% |
| Unemployment rate | 2.4% | 5.8% | 5.2% |
The median household income in Johnson County is about 22% lower than in Illinois.
Housing
| Metric | Johnson County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $42,321 | $162,405 | $242,182 |
| Median rent | $633 | $1,226 | $1,342 |
| Homeownership rate | 84.7% | 66.8% | 65.1% |
The median home price in Johnson County is about 5.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $633 per month for that long.
Commute Time & Mobility
Commuters in Johnson County spend about 60 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 251 hours, about 10.5 full days, spent commuting.
| Metric | Johnson County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 30.1 | 23.8 | 22.5 |
| Round-trip commute (min) | 60.2 | 47.6 | 44.9 |
| Yearly time spent (hours) | 251 | 198 | 187 |
| Estimated yearly cost | $7,778 | $6,148 | $5,803 |
| Work from home | 5.5% | 14.0% | 13.4% |
| Highway traffic (vehicles/day) | 3,263 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 490 | 1,547 | 1,355 |
Fastest commutes among counties in
Illinois:
Edgar County (12.1 min), Brown County (12.8 min), McDonough County (13.0 min).
Slowest:
Calhoun County (46.4 min), Cook County (30.8 min), Kendall County (30.7 min).
The average commute time in Johnson County is 30 minutes, longer 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
Johnson County has a education index of F, which means it scores poorly in education.
| Metric | Johnson County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 15.4% | 34.1% | 31.6% |
| Average household size | 2.78 | 2.48 | 2.54 |
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
Johnson County has a health index of C, which means it is somewhat healthy.
| Metric | Johnson County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 77.4 | 77.9 | 78.3 |
| Self-rated poor health | 22.5% | 15.6% | 16.3% |
| Smokers | 26.2% | 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).
Frequently Asked Questions
Common questions about Johnson County, Illinois.
What is the population of Johnson County, Illinois?
The population of Johnson County, Illinois is 12,794, compared to the U.S. total of 334,821,731.
What is the population density of Johnson County, Illinois?
The population density of Johnson County, Illinois is 36.7 people per square mile, compared to the U.S. average of 85.8 people per square mile.
What is the median household income in Johnson County, Illinois?
The median household income in Johnson County, Illinois is $64,254, compared to the U.S. median of $78,145.
What is the median home price in Johnson County, Illinois?
The median home price in Johnson County, Illinois is $42,321, compared to the U.S. median of $242,182.
What is the unemployment rate in Johnson County, Illinois?
The unemployment rate in Johnson County, Illinois is 2.4%, compared to the U.S. average of 5.2%.