| Name | Johnson County |
| State | Iowa |
| FIPS Code | 19103 |
| County Seat | Iowa City |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 158,202 |
| Population Growth Rate(2020-2024) | 3.38% |
| Majority Ethnicity | White 79.32% |
| Public School Majority Ethnicity | White 60% |
| Partisan Voting Index | Democratic:+20 |
| Unemployment Rate (May 2026) | 2.8% |
| Sales Tax Rate (2025) | 6% |
| Area Code(s) | 319 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 79.32% |
| African American | 7.72% |
| Hispanic | 6.8% |
| Asian | 5.95% |
| Native American | 0.18% |
| Hawaiin/Pacific Islander | 0.03% |
| 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% |