| Name | Johnson County |
| State | Kansas |
| FIPS Code | 20091 |
| County Seat | Olathe |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 625,444 |
| Population Growth Rate(2020-2024) | 2.49% |
| Majority Ethnicity | White 80.51% |
| Public School Majority Ethnicity | White 67% |
| Partisan Voting Index | Democratic:+3 |
| Unemployment Rate (May 2026) | 4.0% |
| Sales Tax Rate (2025) | 9.48% |
| Area Code(s) | 913 / 785 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 80.51% |
| African American | 4.9% |
| Hispanic | 9.1% |
| Asian | 5.18% |
| Native American | 0.27% |
| Hawaiin/Pacific Islander | 0.04% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 66.62% |
| African American | 6.59% |
| Hispanic | 14.78% |
| Asian | 5.98% |
| Native American | 0.29% |
| Hawaiin/Pacific Islander | 0.14% |