| Name | Piatt County |
| State | Illinois |
| FIPS Code | 17147 |
| County Seat | Monticello |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 16,679 |
| Population Growth Rate(2000-2022) | -0.33% |
| Majority Ethnicity | White 98.83% |
| Public School Majority Ethnicity | White 93% |
| Partisan Voting Index | Republican:+16 |
| Unemployment Rate (January 2025) | 3.2% |
| Area Code(s) | 217 / 309 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 98.83% |
| African American | 1% |
| Hispanic | 0.09% |
| Asian | 0.07% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 92.71% |
| African American | 1.46% |
| Hispanic | 1.91% |
| Asian | 0.75% |
| Native American | 0.04% |
| Hawaiin/Pacific Islander | 0.04% |