Adams County | |
|---|---|
 | |
 Location within the U.S. state of Illinois | |
 Illinois's location within the U.S. | |
| Coordinates: 39°59′N 91°11′W / 39.99°N 91.19°W | |
| Country |  United States |
| State |  Illinois |
| Founded | 1825 |
| Named for | John Quincy Adams |
| Seat | Quincy |
| Largest city | Quincy |
| Area | |
• Total | 871 sq mi (2,260 km2) |
| • Land | 855 sq mi (2,210 km2) |
| • Water | 16 sq mi (40 km2) 1.9% |
| Population (2020) | |
• Total | 65,737 |
• Estimate (2023) | 64,441  |
| • Density | 75/sq mi (29/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 15th |
| Website | www |
Adams County is the westernmost county in the U.S. state of Illinois. As of the 2020 census, the population was 65,737.[1] Its county seat is Quincy.[2] Adams County is part of the Quincy, IL–MO Micropolitan Statistical Area.
- ^ "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved July 3, 2014.
- ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.