Adams County | |
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![]() 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 | ![]() |
State | ![]() |
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 |
• 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.