| Place Name | Marianna |
| Place Type | Borough |
| ZIP Code(s) | 15345 |
| County | Washington County |
| Area Code(s) | 724,878 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 539 |
| Population Growth Rate (2010-19) | -19.23% |
| Majority Ethnicity | White 97.59% |
| Metro/Micro Stats Area | Pittsburgh, PA |
| US Congressional District(s) | Pennsylvania 18th |
| State House Districts | 49 |
| State Senate Districts | 46 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.59% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.41% |