| Place Name | Decatur |
| Place Type | Town |
| ZIP Code(s) | 53502 53520 53550 53566 53570 |
| County | Green County |
| Area Code(s) | 608 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 1,714 |
| Majority Ethnicity | White 97.02% |
| Metro/Micro Stats Area | Madison, WI |
| US Congressional District(s) | Wisconsin 2nd |
| State Assembly Districts | 45 |
| State Senate Districts | 15 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.02% |
| African American | 0% |
| Hispanic | 0.18% |
| Asian | 0.41% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.4% |