Adams County, Illinois

Adams County is the westernmost county in the U.S. state of Illinois. As of the 2020 census, the population was 65,737. Its county seat is Quincy. Adams County is part of the Quincy, IL–MO Micropolitan Statistical Area.

Adams County
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 39°59′N 91°11′W
Country United States
State Illinois
Founded1825
Named forJohn Quincy Adams
SeatQuincy
Largest cityQuincy
Area
  Total871 sq mi (2,260 km2)
  Land855 sq mi (2,210 km2)
  Water16 sq mi (40 km2)  1.9%
Population
 (2020)
  Total65,737
  Density75/sq mi (29/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitewww.co.adams.il.us
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