| Place Name | Charter Oak Township |
| Place Type | Township |
| ZIP Code(s) | 51060 51439 |
| County | Crawford County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 705 |
| Majority Ethnicity | White 93.93% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 18 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 93.93% |
| African American | 0% |
| Hispanic | 0.41% |
| Asian | 1.38% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.28% |