| Place Name | Castana |
| Place Type | City |
| ZIP Code(s) | 51010 |
| County | Monona County |
| Area Code(s) | 712 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 140 |
| Population Growth Rate (2010-19) | -27.21% |
| Majority Ethnicity | White 100% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 17 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |