| Name | Johnson County |
| State | Iowa |
| FIPS Code | 19103 |
| County Seat | Iowa City |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 131,627 |
| Population Growth Rate(2000-2022) | 16.79% |
| Majority Ethnicity | White 85.07% |
| Public School Majority Ethnicity | White 60% |
| Partisan Voting Index | Strongly Democratic:+21 |
| Unemployment Rate (November 2024) | 2.1% |
| Area Code(s) | 319 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 85.07% |
| African American | 7.98% |
| Hispanic | 0.2% |
| Asian | 6.63% |
| Native American | 0.06% |
| Hawaiin/Pacific Islander | 0.06% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 59.84% |
| African American | 18.38% |
| Hispanic | 11.42% |
| Asian | 4.14% |
| Native American | 0.15% |
| Hawaiin/Pacific Islander | 0.14% |