Decatur County's 2026 population is estimated at 2,684, reflecting a -0.59% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Decatur County is the 86th largest county in Kansas. The 2010 population was 2,957 and has grown -9.23% since 2010.
Data after 2023 is projected based on recent change
Overall: 50.1 years
Female: 52.6 years
Male: 47.3 years
There are 2,158 adults, (811 of whom are seniors) in Decatur County.
Female: 1,332 (48.9%)
Male: 1,394 (51.1%)
The racial composition of Decatur County includes 92.7% White, and smaller percentages for other race, Black or African American, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 2,527 | 92.7% |
| Two or more races | 105 | 3.85% |
| Other race | 49 | 1.8% |
| Black or African American | 31 | 1.14% |
| Native American | 14 | 0.51% |
Decatur County 's average per capita income is $34,344. Household income levels show a median of $53,870. The poverty rate stands at 12.73%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $83,452 | - |
| Families | $75,691 | $93,157 |
| Households | $53,870 | $70,420 |
| Non Families | $31,000 | $38,358 |
Average Income
Median Household Income
Poverty Rate
