| Place Name | Adelphi |
| Place Type | Census Designated Place |
| ZIP Code(s) | 20740 20782 20783 20903 |
| County | Prince Georges County |
| Area Code(s) | 240,301 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 15,045 |
| Population Growth Rate (2010-19) | 11.51% |
| Majority Ethnicity | Hispanic 0.91% |
| Metro/Micro Stats Area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| US Congressional District(s) | Maryland 4thMaryland 5th |
| House of Delegates Districts | 21,22,47B |
| State Senate Districts | 21,22,47 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 15.77% |
| African American | 28.11% |
| Hispanic | 0.91% |
| Asian | 7.39% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 47.82% |