| Place Name | Duplain Township |
| Place Type | Township |
| ZIP Code(s) | 48831 48866 48879 |
| County | Clinton County |
| Area Code(s) | 989 |
| Timezone | Eastern Standard Time (EST) |
| Population (2021) | 2,319 |
| Majority Ethnicity | White 95.87% |
| Metro/Micro Stats Area | Lansing-East Lansing, MI |
| US Congressional District(s) | Michigan 4th |
| State House Districts | 93 |
| State Senate Districts | 24 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.87% |
| African American | 1.93% |
| Hispanic | 0% |
| Asian | 0.14% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.07% |