| Place Name | Winthrop |
| Place Type | City |
| ZIP Code(s) | 50682 |
| County | Buchanan County |
| Area Code(s) | 319 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 892 |
| Population Growth Rate (2010-19) | -3.18% |
| Majority Ethnicity | White 98.08% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 64 |
| State Senate Districts | 32 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.08% |
| African American | 0.38% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0.1% |
| Hawaiin/Pacific Islander | 1.44% |