| Name | Jefferson County |
| State | Iowa |
| FIPS Code | 19101 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 16,791 |
| Population Growth Rate(2000-2022) | -7.01% |
| Majority Ethnicity | White 88.49% |
| Public School Majority Ethnicity | White 89% |
| Partisan Voting Index | Republican:+2 |
| Unemployment Rate | 2.6% |
| Race/Ethnicy | Percentage of Population (2018) |
|---|---|
| White | 88.49% |
| African American | 1.89% |
| Hispanic | 3.11% |
| Asian | 6.5% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicy | Percentage of Public School Students (2018) |
|---|---|
| White | 89.12% |
| African American | 1.76% |
| Hispanic | 4.88% |
| Asian | 1.8% |
| Native American | 0.3% |
| Hawaiin/Pacific Islander | 0.17% |