| Place Name | Plymouth |
| Place Type | City |
| ZIP Code(s) | 50464 |
| County | Cerro Gordo County |
| Area Code(s) | 641 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 381 |
| Population Growth Rate (2010-19) | -1.83% |
| Majority Ethnicity | White 92.44% |
| Metro/Micro Stats Area | Mason City, IA |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 52 |
| State Senate Districts | 26 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.44% |
| African American | 2.16% |
| Hispanic | 0.22% |
| Asian | 0.22% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.97% |