| Place Name | Castalia |
| Place Type | City |
| ZIP Code(s) | 52133 |
| County | Winneshiek County |
| Area Code(s) | 563 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 162 |
| Population Growth Rate (2010-19) | -16.18% |
| Majority Ethnicity | White 94.61% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 55 |
| State Senate Districts | 28 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.61% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 5.39% |