| Name | Hamilton County |
| State | Illinois |
| FIPS Code | 17065 |
| County Seat | McLeansboro |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 7,886 |
| Population Growth Rate(2020-2024) | -1.31% |
| Majority Ethnicity | White 97.19% |
| Public School Majority Ethnicity | White 96% |
| Partisan Voting Index | Strongly Republican:+32 |
| Unemployment Rate (May 2026) | 5.8% |
| Sales Tax Rate (2025) | 8.25% |
| Area Code(s) | 618 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 97.19% |
| African American | 0.05% |
| Hispanic | 1.36% |
| Asian | 0.88% |
| Native American | 0.05% |
| Hawaiin/Pacific Islander | 0.47% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 95.72% |
| African American | 0.86% |
| Hispanic | 1.89% |
| Asian | 0.26% |
| Native American | 0.26% |
| Hawaiin/Pacific Islander | 0% |