| Place Name | Monongahela |
| Place Type | City |
| ZIP Code(s) | 15063 |
| County | Washington County |
| Area Code(s) | 724,878 |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 4,305 |
| Population Growth Rate (2010-19) | -3.28% |
| Majority Ethnicity | White 96.87% |
| Metro/Micro Stats Area | Pittsburgh, PA |
| US Congressional District(s) | Pennsylvania 9th |
| State House Districts | 49 |
| State Senate Districts | 46 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 96.87% |
| African American | 2.21% |
| Hispanic | 0% |
| Asian | 0.42% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.5% |