| Place Name | Decatur |
| Place Type | City |
| ZIP Code(s) | 46733 |
| County | Adams County |
| Area Code(s) | 260 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 10,062 |
| Population Growth Rate (2010-19) | 5.40% |
| Majority Ethnicity | White 91.06% |
| Metro/Micro Stats Area | Decatur, IN |
| US Congressional District(s) | Indiana 3rd |
| State House Districts | 79 |
| State Senate Districts | 19 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 91.06% |
| African American | 0.46% |
| Hispanic | 0.1% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 8.38% |