Osage County's 2026 population is estimated at 15,615, reflecting a -0.39% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Osage County is the 33rd largest county in Kansas. The 2010 population was 16,274 and has grown -4.05% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.9 years
Female: 44.1 years
Male: 42.1 years
There are 12,119 adults, (3,288 of whom are seniors) in Osage County.
Female: 7,724 (49.1%)
Male: 8,020 (50.9%)
The racial composition of Osage County includes 92.73% White, and smaller percentages for other race, Native American, Black or African American, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 14,600 | 92.73% |
| Two or more races | 909 | 5.77% |
| Other race | 122 | 0.77% |
| Native American | 46 | 0.29% |
| Black or African American | 44 | 0.28% |
| Asian | 23 | 0.15% |
Osage County 's average per capita income is $48,180. Household income levels show a median of $74,467. The poverty rate stands at 9.71%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $98,221 | - |
| Families | $91,179 | $101,084 |
| Households | $74,467 | $85,289 |
| Non Families | $40,984 | $49,815 |
Average Income
Median Household Income
Poverty Rate
