| Place Name | St. Marys |
| Place Type | City |
| County | Elk County |
| Area Code(s) | 814 |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 13,095 |
| Population Growth Rate (2010-19) | -2.54% |
| Majority Ethnicity | White 98.02% |
| Metro/Micro Stats Area | St. Marys, PA |
| US Congressional District(s) | Pennsylvania 5th |
| State House Districts | 75 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.02% |
| African American | 0.4% |
| Hispanic | 0% |
| Asian | 0.35% |
| Native American | 0.12% |
| Hawaiin/Pacific Islander | 1.11% |