Johnson County, Kansas
Located in Kansas, Johnson County has a population of 620,631 residents and a median age of 38.6 years, making it the #112 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 5.4%. The median home value is $391,200, and the median household income is $109,208, which is 45% above the national median.
Demographics
Johnson County has a population of 620,631, making it the #112 most populous county in the US. The median age is 38.6 years, which is 0.8% below the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Johnson County is $109,208, ranking #106 out of 3,222 counties — 45.3% above the national median. The poverty rate is 5.4% and unemployment stands at 3.2%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Johnson County is $391,200 (+38.8% vs national). Renters pay a median of $1,434/mo and the homeownership rate is 68.5%.
Median Home Value Trend
Rankings →Household Type
Education
In Johnson County, 57.6% of adults age 25+ hold a bachelor's degree or higher, which is 70.8% above the national average, ranking #35 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Johnson County is 80.6 years. 10.1% of adults report poor or fair health and 5.9% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
9.6% of adults in Johnson County smoke , 31.6% are obese , and 20.6% report excessive drinking. The drug overdose death rate is 15.4 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Johnson County is 2.2 per 100,000 and the suicide rate is 16.1 per 100,000. Motor vehicle deaths occur at a rate of 5.6 per 100,000.
Homicide Rate Trend
Families & Children
4.9% of children in Johnson County live in poverty and the infant mortality rate is 3.9 per 1,000 live births. The teen birth rate is 6.7 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Johnson County is 81.1%. The mean commute time is 22.8 min, which is 17.5% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Johnson County voted Democratic with a margin of 8.5%. The vote was 53.4% Dem / 44.9% Rep. Compared to 2020, the margin shifted +0.3 toward Democrats .
Vote Share Over Time
About Johnson County, Kansas
Johnson County, Kansas has a total population of 620,631, making it the 112th most populous county in the United States. The median age in Johnson County is 38.6 years, which is 0.8% below the national median of 38.9 years.
The median household income in Johnson County is $109,208, which ranks #106 of 3,222 counties nationwide. This is 45.3% above the national median of $75,149. The poverty rate is 5.4%, lower than the national rate of 12.6%. The unemployment rate stands at 3.2%.
The median home value in Johnson County is $391,200, 38.8% above the national median. Renters in Johnson County pay a median gross rent of $1,434 per month. The homeownership rate is 68.5%, compared to the national rate of 64.4%.
In Johnson County, 57.6% of residents aged 25 and older hold a bachelor's degree or higher, 70.8% above the national average of 33.7%. Health insurance coverage stands at 95.1% of the population. The average commute time for workers is 22.8 min.
Johnson County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 76.1% of the population, followed by Hispanic or Latino (9.3%) and Asian (non-Hispanic) (5.2%).
All data for Johnson County, Kansas comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.