| Place Name | Clarksville |
| Place Type | City |
| ZIP Code(s) | 63336 |
| County | Pike County |
| Area Code(s) | 573 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 396 |
| Population Growth Rate (2010-19) | -15.84% |
| Majority Ethnicity | White 95.68% |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 40 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.68% |
| African American | 3.38% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.94% |