| Place Name | Decatur |
| Place Type | Town |
| ZIP Code(s) | 37322 |
| County | Meigs County |
| Area Code(s) | 423 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 1,433 |
| Population Growth Rate (2010-19) | -2.19% |
| Majority Ethnicity | White 94.12% |
| US Congressional District(s) | Tennessee 4th |
| State House Districts | 22 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.12% |
| African American | 3.85% |
| Hispanic | 0.28% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.75% |