| Place Name | Charter Oak |
| Place Type | City |
| ZIP Code(s) | 51439 |
| County | Crawford County |
| Area Code(s) | 712 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 418 |
| Population Growth Rate (2010-19) | 6.57% |
| Majority Ethnicity | White 94.4% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 18 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.4% |
| African American | 0% |
| Hispanic | 0.49% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 5.11% |