| Place Name | Irwin |
| Place Type | City |
| ZIP Code(s) | 51446 |
| County | Shelby County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 389 |
| Population Growth Rate (2010-19) | -6.45% |
| Majority Ethnicity | White 99.14% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 18 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.14% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.86% |