| Place Name | Armstrong |
| Place Type | City |
| ZIP Code(s) | 50514 |
| County | Emmet County |
| Area Code(s) | 712 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 904 |
| Population Growth Rate (2010-19) | -5.51% |
| Majority Ethnicity | White 98.42% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 7 |
| State Senate Districts | 4 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.42% |
| African American | 0.73% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.85% |