| Place Name | Hartwick Township |
| Place Type | Township |
| ZIP Code(s) | 49631 49655 49665 49688 |
| County | Osceola County |
| Area Code(s) | 231 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2021) | 605 |
| Majority Ethnicity | White 93.5% |
| US Congressional District(s) | Michigan 4th |
| State House Districts | 102 |
| State Senate Districts | 35 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 93.5% |
| African American | 2.76% |
| Hispanic | 0% |
| Asian | 0.65% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.09% |