| Place Name | Washington Township (Grundy County) |
| Place Type | Township |
| ZIP Code(s) | 50638 50657 50669 |
| County | Grundy County |
| Area Code(s) | 319 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 390 |
| Majority Ethnicity | White 99.49% |
| Metro/Micro Stats Area | Waterloo-Cedar Falls, IA |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 50 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.49% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0.51% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |