| Place Name | Adelphi |
| Place Type | Village |
| ZIP Code(s) | 43101 |
| County | Ross County |
| Area Code(s) | 220,740 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 345 |
| Population Growth Rate (2010-19) | -15.26% |
| Majority Ethnicity | White 97.2% |
| Metro/Micro Stats Area | Chillicothe, OH |
| US Congressional District(s) | Ohio 15th |
| State House Districts | 92 |
| State Senate Districts | 17 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.2% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 2.8% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |