How many people live in Leavenworth County, KS?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 84,700 people living in Leavenworth County, KS. That makes Leavenworth County the sixth-most populous county in Kansas. It is home to 2.8% of people living in the state.
84.7K
population of Leavenworth County, KS (2024)
2.8%
County share of the Kansas population (2024)
About 84,700 people lived in Leavenworth County, KS in 2024.
Population estimates, 2000–2024
What are Leavenworth County, KS’s age demographics?
About 14,400 Leavenworth County, KS residents are aged 65 and older in 2024. That represents 17% of its population. For comparison, the age group represents 17.9% of Kansas’ population and 18% in the US overall.
Another 19,800 Leavenworth County residents, or 23.4% of the population, were children under 18. For comparison, the age group represents 23.5% of Kansas’s population and 21.6% in the US overall.
A higher share of Leavenworth County, KS's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Leavenworth County, KS’s racial and ethnic demographics?
Non-Hispanic white residents make up 78.4% of the Leavenworth County, KS population, higher than the national share of 57.5%. Leavenworth County also has a larger share of people identifying as non-Hispanic two or more races (3.2%) than the US overall (2.5%).
In contrast, Leavenworth County’s Hispanic population accounts for 8.1%, below the 20% nationwide, and the non-Hispanic Asian population makes up 1.4% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Leavenworth County, KS has a higher share of a non-Hispanic white population than Kansas as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Leavenworth County, KS is Leavenworth with about 37,400 residents in 2024.
Cities and towns in Leavenworth County, KS ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Leavenworth | 37,370 |
| 2. | Lansing | 11,316 |
| 3. | Basehor | 7,996 |
| 4. | Tonganoxie (pt.) | 3,693 |
| 5. | Tonganoxie (pt.) | 2,502 |
| 6. | High Prairie | 2,128 |
| 7. | Kickapoo | 1,860 |
| 8. | Reno | 1,478 |
| 9. | Delaware | 1,117 |
| 10. | Alexandria | 884 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
