| Place Name | Plain Grove Township |
| Place Type | Township |
| ZIP Code(s) | 16057 16127 16137 16156 |
| County | Lawrence County |
| Area Code(s) | 724,878 |
| Timezone | Eastern Standard Time (EST) |
| Population (2021) | 827 |
| Majority Ethnicity | White 96.64% |
| Metro/Micro Stats Area | New Castle, PA |
| US Congressional District(s) | Pennsylvania 3rd |
| State House Districts | 10 |
| State Senate Districts | 47 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 96.64% |
| African American | 1.74% |
| Hispanic | 0% |
| Asian | 0.5% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.12% |