| Place Name | Smithfield Township |
| Place Type | Township |
| ZIP Code(s) | 50606 50655 52142 |
| County | Fayette County |
| Area Code(s) | 563 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 206 |
| Majority Ethnicity | White 100% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 64 |
| State Senate Districts | 32 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |