| Place Name | Harlan Township |
| Place Type | Township |
| ZIP Code(s) | 45107 45113 45122 45152 45162 |
| County | Warren County |
| Area Code(s) | 283,513,326,937 |
| Timezone | Eastern Standard Time (EST) |
| Population (2021) | 4,908 |
| Majority Ethnicity | White 99.53% |
| Metro/Micro Stats Area | Cincinnati, OH-KY-IN |
| US Congressional District(s) | Ohio 1st |
| State House Districts | 62 |
| State Senate Districts | 7 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.53% |
| African American | 0.14% |
| Hispanic | 0% |
| Asian | 0.06% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.27% |