Map of 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 overview:
Name:Adams County
FIPS code:17-001
Named for:John Quincy Adams
Largest city:Quincy
Total Area:871 sq mi (2,260 km²)
Land Area:855 sq mi (2,210 km²)
Total Population:65,737
Population Density:75/sq mi (29/km²)
Time zone:UTC−6 (Central)
Summer Time Zone (DST):UTC−5 (CDT)

Adams County location map. Where is Adams County?

Adams County location on the U.S. Map. Where is Adams County.
Location of Adams County in the the United States.
Adams County location on the Illinois map. Where is Adams County.
Location of Adams County in Illinois.


Adams County was formed in 1825 out of Pike County. Its name is in honor of the sixth President of the United States, John Quincy Adams.

Adams County Road Map

Adams CountyStreet Map.
Street map of Adams County, Illinois. Source: OpenStreetMap (OSM)
Adams CountyMap
Adams Countypolitical map.


According to the U.S. Census Bureau, the county has a total area of 871 square miles (2,260 km), of which 855 square miles (2,210 km) is land and 16 square miles (41 km) (1.9%) is water.

Adjacent counties

Public transit

  • Quincy Transit Lines
  • Quincy station
  • Burlington Trailways
  • List of intercity bus stops in Illinois

Major highways

  • Interstate 172
  • US Route 24
  • US Route 36
  • Illinois Route 57
  • Illinois Route 61
  • Illinois Route 94
  • Illinois Route 96
  • Illinois Route 104
  • Illinois Route 336

National protected area

  • Great River National Wildlife Refuge (part)

Climate and weather

In recent years, average temperatures in the county seat of Quincy have ranged from a low of 16 °F (−9 °C) in January to a high of 88 °F (31 °C) in July, although a record low of −21 °F (−29 °C) was recorded in January 1979 and a record high of 105 °F (41 °C) was recorded in July 2005. Average monthly precipitation ranged from 1.36 inches (35 mm) in January to 4.61 inches (117 mm) in May.

Adams County Topographic Map

Topographic Map of Adams County, Illinois
Adams County Topo map.

Adams County Satellite Map

Satellite Map of Adams County, Illinois
Adams County satellite map.

Adams County Outline Map

Outline Map of Adams County, Illinois
Adams County outline map.

See also

Map of Illinois State and its subdivision: Map of other states:
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