| Place Name | Decker Township |
| Place Type | Township |
| ZIP Code(s) | 62446 62450 62824 62868 |
| County | Richland County |
| Area Code(s) | 618 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 420 |
| Majority Ethnicity | White 100% |
| US Congressional District(s) | Illinois 15th |
| State House Districts | 109 |
| State Senate Districts | 55 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |