| Place Name | Mercer Township |
| Place Type | Township |
| ZIP Code(s) | 50841 50851 50859 |
| County | Adams County |
| Area Code(s) | 641 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 90 |
| Majority Ethnicity | White 98.55% |
| US Congressional District(s) | Iowa 3rd |
| State House Districts | 21 |
| State Senate Districts | 11 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.55% |
| African American | 1.45% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |