| Place Name | Jefferson Township (Buchanan County) |
| Place Type | Township |
| County | Buchanan County |
| Area Code(s) | 319 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 935 |
| Majority Ethnicity | White 97.37% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 64 |
| State Senate Districts | 32 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.37% |
| African American | 0.42% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.21% |