| Place Name | Plymouth |
| Place Type | Village |
| ZIP Code(s) | 62367 |
| County | Hancock County |
| Area Code(s) | 309 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 458 |
| Population Growth Rate (2010-19) | -13.66% |
| Majority Ethnicity | White 95.12% |
| Metro/Micro Stats Area | Fort Madison-Keokuk, IA-IL-MOMacomb, IL |
| US Congressional District(s) | Illinois 18th |
| State House Districts | 94 |
| State Senate Districts | 47 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.12% |
| African American | 4.03% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.85% |