| Name | Adams County |
| State | Illinois |
| FIPS Code | 17001 |
| County Seat | Quincy |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 64,435 |
| Population Growth Rate(2020-2024) | -2.02% |
| Majority Ethnicity | White 93.53% |
| Public School Majority Ethnicity | White 81% |
| Partisan Voting Index | Strongly Republican:+24 |
| Unemployment Rate (May 2026) | 4.0% |
| Sales Tax Rate (2025) | 6.5% |
| Area Code(s) | 217 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 93.53% |
| African American | 3.66% |
| Hispanic | 2.07% |
| Asian | 0.69% |
| Native American | 0.04% |
| Hawaiin/Pacific Islander | 0.02% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 81.3% |
| African American | 5.92% |
| Hispanic | 3.09% |
| Asian | 0.54% |
| Native American | 0.13% |
| Hawaiin/Pacific Islander | 0.08% |