| Place Name | Grand Marsh |
| Place Type | Census Designated Place |
| ZIP Code(s) | 53936 |
| County | Adams County |
| Area Code(s) | 608 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 64 |
| Population Growth Rate (2010-19) | -13.39% |
| Majority Ethnicity | White 77.36% |
| US Congressional District(s) | Wisconsin 3rd |
| State Assembly Districts | 41 |
| State Senate Districts | 14 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.36% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 22.64% |