| Place Name | Clarksville |
| Place Type | City |
| ZIP Code(s) | 50619 |
| County | Butler County |
| Area Code(s) | 319 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 1,431 |
| Population Growth Rate (2010-19) | -12.16% |
| Majority Ethnicity | White 94.69% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 54 |
| State Senate Districts | 27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.69% |
| African American | 0.45% |
| Hispanic | 0% |
| Asian | 0.23% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.62% |