| Place Name | Irwin Township |
| Place Type | Township |
| ZIP Code(s) | 16038 16127 16153 16342 16374 |
| County | Venango County |
| Area Code(s) | 814 |
| Timezone | Eastern Standard Time (EST) |
| Population (2021) | 1,135 |
| Majority Ethnicity | White 98.05% |
| Metro/Micro Stats Area | Oil City, PA |
| US Congressional District(s) | Pennsylvania 5th |
| State House Districts | 64 |
| State Senate Districts | 21 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.05% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.95% |