How many people live in Decatur County, KS?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 2,700 people living in Decatur County, KS. That makes Decatur County the 85th-most populous county in Kansas. It is home to 0.09% of people living in the state.
2.72K
population of Decatur County, KS (2024)
0.09%
County share of the Kansas population (2024)
About 2,700 people lived in Decatur County, KS in 2024.
Population estimates, 2000–2024
What are Decatur County, KS’s age demographics?
About 822 Decatur County, KS residents are aged 65 and older in 2024. That represents 30.3% of its population. For comparison, the age group represents 17.9% of Kansas's population and 18% in the US overall.
Another 572 Decatur County residents, or 21.1% 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 Decatur County, KS's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Decatur County, KS’s racial and ethnic demographics?
Non-Hispanic white residents make up 89.1% of the Decatur County population, higher than the national share of 57.5%. Decatur County also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (0.88%) than the US overall (0.72%).
In contrast, Decatur County’s Hispanic population accounts for 6.6%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 1.2% of the county, compared with 12.6% 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.
Decatur 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 Decatur County, KS is Oberlin with about 1,600 residents in 2024.
Cities and towns in Decatur County, KS ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Oberlin | 1,610 |
| 2. | Norcatur | 160 |
| 3. | Oberlin | 78 |
| 4. | Jennings (pt.) | 78 |
| 5. | Beaver | 65 |
| 6. | Liberty | 62 |
| 7. | Center | 53 |
| 8. | Olive | 51 |
| 9. | Dresden | 43 |
| 10. | Finley | 38 |
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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.
