| Place Name | Mount Ayr |
| Place Type | Town |
| ZIP Code(s) | 47964 |
| County | Newton County |
| Area Code(s) | 219 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 165 |
| Population Growth Rate (2010-19) | -4.10% |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Chicago-Naperville-Elgin, IL-IN-WI |
| US Congressional District(s) | Indiana 4th |
| State House Districts | 16 |
| State Senate Districts | 6 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |