| Name | Warren County |
| State | Illinois |
| FIPS Code | 17187 |
| County Seat | Monmouth |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 17,723 |
| Population Growth Rate(2000-2022) | -4.92% |
| Majority Ethnicity | White 92.24% |
| Public School Majority Ethnicity | White 67% |
| Partisan Voting Index | Republican:+12 |
| Unemployment Rate (January 2025) | 4.3% |
| Area Code(s) | 309 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 92.24% |
| African American | 4.14% |
| Hispanic | 1.1% |
| Asian | 1.61% |
| Native American | 0.46% |
| Hawaiin/Pacific Islander | 0.46% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 66.61% |
| African American | 3.79% |
| Hispanic | 20.83% |
| Asian | 2.84% |
| Native American | 0.09% |
| Hawaiin/Pacific Islander | 0.17% |