| Place Name | Marion Township (Mercer County) |
| Place Type | Township |
| ZIP Code(s) | 64632 64661 |
| County | Mercer County |
| Area Code(s) | 660 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 701 |
| Majority Ethnicity | White 94.1% |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 3 |
| State Senate Districts | 12 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.1% |
| African American | 0.43% |
| Hispanic | 0% |
| Asian | 2.01% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.45% |