The 5 largest ethnic groups in Jefferson County, KS are White (Non-Hispanic) (91.6%), Two Races Excluding Other, & Three or More Races (Non-Hispanic) (2.65%), White (Hispanic) (1.6%), Two Races Including Other (Hispanic) (1.28%), and Two Races Including Other (Non-Hispanic) (0.87%).
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.
99.6% of the residents in Jefferson County, KS are U.S. citizens.
Jefferson County, KS borders Atchison County, KS, Douglas County, KS, Jackson County, KS, Leavenworth County, KS, and Shawnee County, KS.