| Place Name | Quincy |
| Place Type | City |
| ZIP Code(s) | 62301 62305 |
| County | Adams County |
| Area Code(s) | 217 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 40,647 |
| Population Growth Rate (2010-19) | -2.88% |
| Majority Ethnicity | White 90.74% |
| Metro/Micro Stats Area | Quincy, IL-MO |
| US Congressional District(s) | Illinois 18th |
| State House Districts | 94 |
| State Senate Districts | 47 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 90.74% |
| African American | 6.44% |
| Hispanic | 0.06% |
| Asian | 0.85% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 1.9% |