Jefferson County, Kansas Demographics 2026

Population Overview

Jefferson County is located in Kansas with a total population of 18,391. It is the 30th most populous county out of 105 in Kansas.

Age Demographics

The median age in Jefferson County is 43.8 years. This is 18% higher than the state median of 37.2 years.

Economy, Income & Housing

The median household income in Jefferson County is $77,393. This is 7% higher than the state median of $72,639. Compared to the national median of $78,538, household income here is 1% lower. The poverty rate stands at 6.3%. This is 45% lower than the state poverty rate of 11.5%. The unemployment rate is 2.4%. This is 40% lower than the state rate of 3.9%. The median home value is $200,800. Housing costs are 1% lower than the state median of $203,400. With a home-value-to-income ratio of just 2.6x, Jefferson County is one of the most affordable housing markets in the area. 85.0% of occupied housing units are owner-occupied. This homeownership rate is 27% higher than the state average of 66.9%.

Race & Ethnicity

Jefferson County has a predominantly White (non-Hispanic) population, comprising 91.6% of all residents. Hispanic or Latino residents account for 3.4%. The Black or African American population (0.6%) is well below the state average of 5.3%. The Hispanic or Latino population (3.4%) is well below the state average of 13.3%. The Asian population (0.2%) is well below the state average of 2.9%.

Education

24.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 30% lower than the state rate of 35.2%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.2%.