| Place Name | Washington Township (Mercer County) |
| Place Type | Township |
| ZIP Code(s) | 45822 45828 45846 |
| County | Mercer County |
| Area Code(s) | 419,567 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2021) | 1,029 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Celina, OH |
| US Congressional District(s) | Ohio 5th |
| State House Districts | 84 |
| State Senate Districts | 12 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |