| Place Name | Monmouth |
| Place Type | City |
| ZIP Code(s) | 97361 |
| County | Polk County |
| Area Code(s) | 503,971 |
| Timezone | Pacific Standard Time (PST) |
| Population (2022) | 9,549 |
| Population Growth Rate (2010-19) | 16.53% |
| Majority Ethnicity | White 74.16% |
| Metro/Micro Stats Area | Salem, OR |
| US Congressional District(s) | Oregon 5th |
| State House Districts | 20 |
| State Senate Districts | 10 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 74.16% |
| African American | 1.91% |
| Hispanic | 2.31% |
| Asian | 2.61% |
| Native American | 0.75% |
| Hawaiin/Pacific Islander | 18.25% |