| Place Name | Marengo Township |
| Place Type | Township |
| ZIP Code(s) | 52209 52251 52301 |
| County | Iowa County |
| Area Code(s) | 319 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 2,687 |
| Majority Ethnicity | White 97.04% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 75 |
| State Senate Districts | 38 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.04% |
| African American | 0.3% |
| Hispanic | 0% |
| Asian | 0.26% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.4% |