| Name | Sumner County |
| State | Kansas |
| FIPS Code | 20191 |
| County Seat | Wellington |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 22,393 |
| Population Growth Rate(2020-2024) | 0.11% |
| Majority Ethnicity | White 90.91% |
| Public School Majority Ethnicity | White 82% |
| Partisan Voting Index | Strongly Republican:+26 |
| Unemployment Rate (May 2026) | 4.2% |
| Sales Tax Rate (2025) | 7.5% |
| Area Code(s) | 620 / 316 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 90.91% |
| African American | 1.15% |
| Hispanic | 5.96% |
| Asian | 0.43% |
| Native American | 1.54% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 82.26% |
| African American | 1.32% |
| Hispanic | 9.21% |
| Asian | 0.39% |
| Native American | 0.87% |
| Hawaiin/Pacific Islander | 0.04% |