| Place Name | Greenbrier Township |
| Place Type | Township |
| ZIP Code(s) | 50026 50129 51462 |
| County | Greene County |
| Area Code(s) | 641,515,712 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 206 |
| Majority Ethnicity | White 100% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 47 |
| State Senate Districts | 24 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |