| Place Name | Monmouth |
| Place Type | City |
| ZIP Code(s) | 52309 |
| County | Jackson County |
| Area Code(s) | 563 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 118 |
| Population Growth Rate (2010-19) | -15.69% |
| Majority Ethnicity | White 89.76% |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 58 |
| State Senate Districts | 29 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 89.76% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 10.24% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |