| Name | Marshall County |
| State | Illinois |
| FIPS Code | 17123 |
| County Seat | Lacon |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 11,650 |
| Population Growth Rate(2020-2024) | -0.82% |
| Majority Ethnicity | White 96.08% |
| Public School Majority Ethnicity | White 92% |
| Partisan Voting Index | Republican:+18 |
| Unemployment Rate (May 2026) | 6.7% |
| Sales Tax Rate (2025) | 6.25% |
| Area Code(s) | 309 / 815 / 779 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 96.08% |
| African American | 0.43% |
| Hispanic | 3.32% |
| Asian | 0.11% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 0.05% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 92.05% |
| African American | 1.21% |
| Hispanic | 4.21% |
| Asian | 0.05% |
| Native American | 0.05% |
| Hawaiin/Pacific Islander | 0.32% |