| Place Name | Lake Seneca |
| Place Type | Census Designated Place |
| ZIP Code(s) | 43543 |
| County | Williams County |
| Area Code(s) | 419,567 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 535 |
| Population Growth Rate (2010-19) | 13.76% |
| Majority Ethnicity | White 92.2% |
| US Congressional District(s) | Ohio 5th |
| State House Districts | 81 |
| State Senate Districts | 1 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.2% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 7.8% |