| Name | Menard County |
| State | Illinois |
| FIPS Code | 17129 |
| County Seat | Petersburg |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 11,996 |
| Population Growth Rate(2020-2024) | -2.5% |
| Majority Ethnicity | White 97.56% |
| Public School Majority Ethnicity | White 94% |
| Partisan Voting Index | Strongly Republican:+21 |
| Unemployment Rate (May 2026) | 5.8% |
| Area Code(s) | 217 / 309 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 97.56% |
| African American | 0.47% |
| Hispanic | 1.57% |
| Asian | 0.39% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 94.21% |
| African American | 1.38% |
| Hispanic | 0.75% |
| Asian | 0.46% |
| Native American | 0.17% |
| Hawaiin/Pacific Islander | 0.06% |