| Place Name | St. Leonard |
| Place Type | Census Designated Place |
| ZIP Code(s) | 20657 20676 20685 |
| County | Calvert County |
| Area Code(s) | 410,443,667 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 795 |
| Population Growth Rate (2010-19) | 4.85% |
| Majority Ethnicity | White 89.67% |
| Metro/Micro Stats Area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| US Congressional District(s) | Maryland 5th |
| House of Delegates Districts | 27C |
| State Senate Districts | 27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 89.67% |
| African American | 1.45% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 8.88% |