Adams County, Illinois
Adams County, Illinois | |
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Seal | |
Location within the U.S. state of Illinois | |
| Coordinates: 39°59′N 91°11′W / 39.99°N 91.19°W | |
| Country | United States |
| State | Illinois |
| Founded | 1825 |
| Named after | 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 (41 km2) 1.9% |
| Population (2020) | |
• Total | 65,737 |
• Estimate (2024) | 64,109 |
| • Density | 76.9/sq mi (29.7/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 United States census, the population was 65,737. Its county seat is Quincy. Adams County is part of the Quincy, IL–MO Micropolitan Statistical Area.