Jefferson County, Kansas
Located in Kansas, Jefferson County has a population of 18,349 residents and a median age of 44.2 years, making it the #1,973 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 5.6%. The median home value is $216,900, and the median household income is $81,278, which is 8% above the national median.
Demographics
Jefferson County has a population of 18,349, making it the #1,973 most populous county in the US. The median age is 44.2 years, which is 13.6% above 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 Jefferson County is $81,278, ranking #530 out of 3,222 counties — 8.2% above the national median. The poverty rate is 5.6% and unemployment stands at 2.4%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Jefferson County is $216,900 (-23.1% vs national). Renters pay a median of $835/mo and the homeownership rate is 85.7%.
Median Home Value Trend
Rankings →Household Type
Education
In Jefferson County, 24.6% of adults age 25+ hold a bachelor's degree or higher, which is 27.0% below the national average, ranking #1,285 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Jefferson County is 76.5 years. 12.9% of adults report poor or fair health and 9.0% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.2% of adults in Jefferson County smoke , 41.5% are obese , and 21.7% report excessive drinking. The drug overdose death rate is 17.9 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 20.2 per 100,000. Motor vehicle deaths occur at a rate of 22.0 per 100,000.
Suicide Rate Trend
Families & Children
9.4% of children in Jefferson County live in poverty . The teen birth rate is 13.0 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Jefferson County is 67.1%. The mean commute time is 32.8 min, which is 18.9% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Jefferson County voted Republican with a margin of 36.9%. The vote was 30.5% Dem / 67.4% Rep. Compared to 2020, the margin shifted 4.7 toward Republicans .
Vote Share Over Time
About Jefferson County, Kansas
Jefferson County, Kansas has a total population of 18,349, making it the 1,973rd most populous county in the United States. The median age in Jefferson County is 44.2 years, which is 13.6% above the national median of 38.9 years.
The median household income in Jefferson County is $81,278, which ranks #530 of 3,222 counties nationwide. This is 8.2% above the national median of $75,149. The poverty rate is 5.6%, lower than the national rate of 12.6%. The unemployment rate stands at 2.4%.
The median home value in Jefferson County is $216,900, 23.1% below the national median. Renters in Jefferson County pay a median gross rent of $835 per month. The homeownership rate is 85.7%, compared to the national rate of 64.4%.
In Jefferson County, 24.6% of residents aged 25 and older hold a bachelor's degree or higher, 27.0% below the national average of 33.7%. Health insurance coverage stands at 94.6% of the population. The average commute time for workers is 32.8 min.
Jefferson County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 91.1% of the population, followed by Two or More Races (4.0%) and Hispanic or Latino (3.5%).
All data for Jefferson 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.