| Place Name | Johnson Township (Plymouth County) |
| Place Type | Township |
| ZIP Code(s) | 51001 51031 51038 |
| County | Plymouth County |
| Area Code(s) | 712 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 329 |
| Majority Ethnicity | White 94.01% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 5 |
| State Senate Districts | 3 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.01% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 5.99% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |