| Place Name | Mason Township |
| Place Type | Township |
| ZIP Code(s) | 62343 63401 |
| County | Marion County |
| Area Code(s) | 573 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 12,291 |
| Majority Ethnicity | White 92.89% |
| Metro/Micro Stats Area | Hannibal, MO |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 5 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.89% |
| African American | 5.27% |
| Hispanic | 0.1% |
| Asian | 0.49% |
| Native American | 0.24% |
| Hawaiin/Pacific Islander | 1.02% |