| Place Name | West Mifflin |
| Place Type | Borough |
| ZIP Code(s) | 15122 |
| County | Allegheny County |
| Area Code(s) | 412,878 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 20,335 |
| Population Growth Rate (2010-19) | -3.56% |
| Majority Ethnicity | White 86.8% |
| Metro/Micro Stats Area | Pittsburgh, PA |
| US Congressional District(s) | Pennsylvania 14th |
| State House Districts | 35,38 |
| State Senate Districts | 45 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 86.8% |
| African American | 11.07% |
| Hispanic | 0.01% |
| Asian | 0.15% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.97% |