In 2021, Jefferson County, KS had a population of 18.4k people with a median age of 43.7 and a median household income of $72,270. Between 2020 and 2021 the population of Jefferson County, KS declined from 18,974 to 18,391, a −3.07% decrease and its median household income grew from $67,429 to $72,270, a 7.18% increase.
The 5 largest ethnic groups in Jefferson County, KS are White (Non-Hispanic) (93%), Two+ (Non-Hispanic) (2.6%), White (Hispanic) (1.71%), Two+ (Hispanic) (0.935%), and Black or African American (Non-Hispanic) (0.669%).
None of the households in Jefferson County, KS reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
99.4% of the residents in Jefferson County, KS are U.S. citizens.
In 2021, the median property value in Jefferson County, KS was $169,900, and the homeownership rate was 84.3%.
Most people in Jefferson County, KS drove alone to work, and the average commute time was 29.2 minutes. The average car ownership in Jefferson County, KS was 2 cars per household.
Jefferson County, KS borders Atchison County, KS, Douglas County, KS, Jackson County, KS, Leavenworth County, KS, and Shawnee County, KS.