Johnson County, Kansas

Johnson County, Kansas, had an estimated population of 636,906 in 2025 across 1,227 km². The figures below come from the US Census Bureau's population estimates and the American Community Survey, each shown with its own vintage and its rank among Kansas's counties and nationally.

Population: 636,906; 2025 estimate
Area: 1,227 km²
Density: 519; per km²
Median income: $109,208; household, ACS 2024
Median age: 38.6; years, ACS 2024

How Kansas's counties spread

Amenities & Infrastructure

Indicator	Value	In Kansas	In the US
Households with Broadband2024	95.9%	1 / 105	23 / 3,144
Median Gross Rent2024	$1,434	1 / 105	285 / 3,137
Median Home Value2024	$391,200	1 / 105	314 / 3,139
Owner-Occupied Homes2024	68.5%	85 / 105	2,384 / 3,144
Vacant Homes2024	3.9%	103 / 105	3,079 / 3,144

Demography

Indicator	Value	In Kansas	In the US
Aged 65 and Over2024	16.0%	90 / 105	2,613 / 3,144
American Indian & Alaska Native2024	0.1%	76 / 105	1,566 / 3,144
Asian, non-Hispanic2024	5.2%	1 / 105	173 / 3,144
Average Household Size2024people	2.5	24 / 105	1,336 / 3,144
Black, non-Hispanic2024	4.8%	8 / 105	1,116 / 3,144
Foreign-Born2024	9.2%	16 / 105	455 / 3,144
Hispanic or Latino2024	9.3%	34 / 105	939 / 3,144
Median Age2024years	38.6	80 / 105	2,376 / 3,144
Sex Ratio2024per 1,000 males	1,023	21 / 105	982 / 3,144
Speak a Language Other Than English2024	12.1%	23 / 105	750 / 3,144
Under 182024	23.5%	46 / 105	848 / 3,144
Veterans2024	5.3%	80 / 105	2,654 / 3,144
White, non-Hispanic2024	76.1%	84 / 105	1,789 / 3,144

Economy

Indicator	Value	In Kansas	In the US
Below Poverty Line2024	5.4%	102 / 105	3,071 / 3,144
Households on SNAP2024	2.0%	102 / 105	3,105 / 3,144
Income Inequality2024index	0.446	32 / 105	1,569 / 3,144
Median Household Income2024	$109,208	1 / 105	106 / 3,143
Per Capita Income2024	$60,137	1 / 105	66 / 3,144
Unemployment Rate2024	3.2%	40 / 105	2,324 / 3,144

Education

Indicator	Value	In Kansas	In the US
Bachelor's Degree or Higher2024	57.6%	1 / 105	35 / 3,144
High School or Higher2024	96.6%	3 / 105	50 / 3,144

Health Coverage

Indicator	Value	In Kansas	In the US
No Health Insurance2024	4.9%	100 / 105	2,562 / 3,144
With a Disability2024	9.0%	103 / 105	3,073 / 3,144

Population & Density

Indicator	Value	In Kansas	In the US
Population2025	636,906	1 / 105	113 / 3,144
Population Density2025/km²	519	1 / 105	121 / 3,144

Work & Commute

Indicator	Value	In Kansas	In the US
Commute by Public Transit2024	0.2%	23 / 105	1,371 / 3,144
Households with No Vehicle2024	3.5%	68 / 105	2,534 / 3,144
Mean Commute Time2024minutes	20.6	34 / 105	2,348 / 3,143
Work from Home2024	22.4%	1 / 105	84 / 3,144

Other counties of Kansas

Compare Johnson County against every other county on a map, add layers and run a scatter — open the atlas. Sources and vintages for every figure on this page are listed under datasets, or browse all 3,144 counties.