| Name | Montgomery County |
| State | Illinois |
| FIPS Code | 17135 |
| County Seat | Hillsboro |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 27,756 |
| Population Growth Rate(2020-2024) | -2.04% |
| Majority Ethnicity | White 94.42% |
| Public School Majority Ethnicity | White 93% |
| Partisan Voting Index | Strongly Republican:+22 |
| Unemployment Rate (May 2026) | 5.8% |
| Sales Tax Rate (2025) | 7.25% |
| Area Code(s) | 217 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 94.42% |
| African American | 2.72% |
| Hispanic | 2.15% |
| Asian | 0.55% |
| Native American | 0.13% |
| Hawaiin/Pacific Islander | 0.02% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 93.07% |
| African American | 0.85% |
| Hispanic | 3.21% |
| Asian | 0.43% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.05% |