| Name | Osage County |
| State | Kansas |
| FIPS Code | 20139 |
| County Seat | Lyndon |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 16,300 |
| Population Growth Rate(2000-2022) | -3.25% |
| Majority Ethnicity | White 99.2% |
| Public School Majority Ethnicity | White 91% |
| Partisan Voting Index | Republican:+20 |
| Unemployment Rate (January 2025) | 3.2% |
| Area Code(s) | 785 / 620 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 99.2% |
| African American | 0.39% |
| Hispanic | 0.24% |
| Asian | 0.15% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 0.01% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 90.78% |
| African American | 0.55% |
| Hispanic | 4.61% |
| Asian | 0.13% |
| Native American | 0.38% |
| Hawaiin/Pacific Islander | 0.04% |