| Place Name | Johnstown (Polk County) |
| Place Type | Town |
| ZIP Code(s) | 54810 54826 54829 54853 54889 |
| County | Polk County |
| Area Code(s) | 535,715 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 574 |
| Majority Ethnicity | White 85.9% |
| US Congressional District(s) | Wisconsin 7th |
| State Assembly Districts | 75 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 85.9% |
| African American | 0% |
| Hispanic | 13.71% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.38% |