| Name | Johnson County |
| State | Kansas |
| FIPS Code | 20091 |
| County Seat | Olathe |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 546,046 |
| Population Growth Rate(2000-2022) | 12.07% |
| Majority Ethnicity | White 88.66% |
| Public School Majority Ethnicity | White 67% |
| Partisan Voting Index | Democratic:+2 |
| Unemployment Rate (December 2024) | 3.2% |
| Area Code(s) | 913 / 785 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 88.66% |
| African American | 5.24% |
| Hispanic | 0.23% |
| Asian | 5.81% |
| Native American | 0.03% |
| Hawaiin/Pacific Islander | 0.03% |
| 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% |