| Place Name | West Middlesex |
| Place Type | Borough |
| ZIP Code(s) | 16159 |
| County | Mercer County |
| Area Code(s) | 724,878 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 855 |
| Population Growth Rate (2010-19) | -5.21% |
| Majority Ethnicity | White 98.35% |
| Metro/Micro Stats Area | Youngstown-Warren-Boardman, OH-PA |
| US Congressional District(s) | Pennsylvania 3rd |
| State House Districts | 7 |
| State Senate Districts | 50 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.35% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0.09% |
| Native American | 0.17% |
| Hawaiin/Pacific Islander | 1.39% |