| Place Name | Jefferson Township (Poweshiek County) |
| Place Type | Township |
| ZIP Code(s) | 52208 52211 52215 52232 |
| County | Poweshiek County |
| Area Code(s) | 319,641 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 507 |
| Majority Ethnicity | White 85.63% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 76 |
| State Senate Districts | 38 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 85.63% |
| African American | 0% |
| Hispanic | 0.2% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 14.17% |