Johnson County, Kansas Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Johnson County, KS 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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A
Health Above averageHealthiest county in Kansas
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A
Income Above averageWealthiest county in Kansas
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A+
Education Top gradeBest educated county in Kansas
Source: Map AI Methodology
Population: density and quick facts
| Metric | Johnson County | Kansas Avg | U.S. Average |
|---|---|---|---|
| Population | 619,445 | 2,945,842 | 337,468,954 |
| Population density (per sq mi) | 1290.9 | 35.8 | 86.4 |
| Population growth (%/yr) | 0.94% | 0.19% | 0.59% |
| Median age | 36.6 | 38.7 | 37.3 |
| Households | 249,120 | 1,173,585 | 130,235,071 |
Population in Johnson County grew by 16.8% from 2009 to 2024, reaching 619,445 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Johnson County is Millennials, aged 29–44, at 23.4% of residents. That is 2.5 points above Kansas as a whole.
- Gen Z 13–28 130,204 21.0% -1.8 pts
- Millennials 29–44 144,966 23.4% +2.5 pts
- Gen X 45–60 125,183 20.2% +1.5 pts
- Boomers 61–79 92,382 14.9% -1.8 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 Kansas, 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 50.5% of the people living in Johnson County and men 49.5%.
- Women 50.5% Kansas 50.0%
- Men 49.5% Kansas 50.0%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Johnson County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Johnson County has a the economy index of A, which means it is very prosperous.
| Metric | Johnson County | Kansas Avg | U.S. Average |
|---|---|---|---|
| Median household income | $109,616 | $74,287 | $80,455 |
| Income growth (%/yr) | 4.26% | 4.08% | 4.80% |
| Unemployment rate | 3.2% | 3.8% | 5.2% |
The median household income in Johnson County is about 48% higher than in Kansas.
Housing
| Metric | Johnson County | Kansas Avg | U.S. Average |
|---|---|---|---|
| Median home price | $260,124 | $104,644 | $248,835 |
| Median rent | $1,433 | $1,060 | $1,407 |
| Homeownership rate | 68.5% | 67.1% | 65.2% |
The median home price in Johnson County is about 15.1 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,433 per month for that long.
Commute Time & Mobility
Commuters in Johnson County spend about 40 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 168 hours, about 7.0 full days, spent commuting.
| Metric | Johnson County | Kansas Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 20.2 | 17.2 | 22.4 |
| Round-trip commute (min) | 40.4 | 34.4 | 44.8 |
| Yearly time spent (hours) | 168 | 143 | 187 |
| Estimated yearly cost | $5,218 | $4,448 | $5,790 |
| Work from home | 22.4% | 11.8% | 15.0% |
| Highway traffic (vehicles/day) | 11,451 | 4,500 | 8,813 |
| Local road traffic (vehicles/day) | 1,965 | 662 | 1,355 |
Fastest commutes among counties in
Kansas:
Wichita County (7.0 min), Scott County (7.1 min), Greeley County (7.2 min).
Slowest:
Linn County (31.3 min), Miami County (30.8 min), Jefferson County (30.3 min).
The average commute time in Johnson County is 20 minutes, longer than the 17 minutes in Kansas.
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 A+, which means it is exceptionally educated.
| Metric | Johnson County | Kansas Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 53.2% | 31.5% | 31.6% |
| Average household size | 2.46 | 2.44 | 2.53 |
Highest education index among counties in
Kansas:
Johnson County (0.4), Douglas County (0.4), Riley County (0.3).
Lowest:
Seward County (0.2), Grant County (0.2), Kearny County (0.2).
Health
Johnson County has a health index of A, which means it is very healthy.
| Metric | Johnson County | Kansas Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 80.7 | 78.6 | 78.3 |
| Self-rated poor health | 8.6% | 15.3% | 16.3% |
| Smokers | 12.1% | 18.7% | 19.0% |
Highest health index among counties in
Kansas:
Johnson County (0.8), Riley County (0.8), Douglas County (0.8).
Lowest:
Wyandotte County (0.8), Woodson County (0.8), Chautauqua County (0.8).
Johnson County, KS Compared With Nearby Counties
Johnson County, KS is the 2nd largest of the 6 counties compared here, 619,445 residents against a local median of 120,302. Where Johnson County, KS breaks from the counties next to it is median home price, sitting 118% above the local median of $119,553 at $260,124.
Median household income tells the same story from another angle: $109,616 against a local median of $70,602, 55% above it. The one measure here that carries a verdict is median household income, and at 55% above the local median it puts Johnson County, KS at the better end of the local range. The counties themselves spread $202,666 on median home price, so Johnson County, KS sits at one end of an already wide local range rather than apart from it. Johnson County, KS has the 2nd highest median home price of the 6 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Johnson County, KS | 619,445 | $109,616 #1/6 | $260,124 #2/6 | 20.2 min #2/6 |
| Wyandotte County, KS | 167,620 | $64,473 | $140,630 | 21.2 min |
| Miami County, KS | 34,938 | $89,392 | $111,141 | 30.8 min |
| Leavenworth County, KS | 83,123 | $88,191 | $88,571 | 22.1 min |
| Douglas County, KS | 120,302 | $70,602 | $291,236 | 17.1 min |
| Jackson County, MO | 719,648 | $68,888 | $119,553 | 22.0 min |
Frequently Asked Questions
Common questions about Johnson County, Kansas.
How many people live in Johnson County, Kansas?
About 619,445 people live in Johnson County, Kansas, in 249,120 households of 2.5 people on average. The median age is 36.6, close to the U.S. median of 37.3.
Is Johnson County, Kansas urban or rural?
Averaged over its land area, Johnson County, Kansas has 1,291 people per square mile, a density typical of urban and suburban areas. That is about 15 times the U.S. average of 86.
Can a typical household afford a home in Johnson County, Kansas?
The median home costs 2.4 times the median household income ($260,124 against $109,616), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $1,433 a month takes about 16% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How strong is the job market in Johnson County, Kansas?
Unemployment in Johnson County, Kansas is only 3.2%, 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 Johnson County, Kansas have a college degree?
53.2% of adults in Johnson County, Kansas hold a bachelor's degree or higher (about 5 in 10), well above the U.S. share of 31.6%.
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