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Adams County, Illinois

Adams County, Illinois
Adams County Courthouse, Quincy.jpg
Map of Illinois highlighting Adams County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded 1825
Named for John Quincy Adams
Seat Quincy
Largest city Quincy
Area
 • Total 871 sq mi (2,256 km2)
 • Land 855 sq mi (2,214 km2)
 • Water 16 sq mi (41 km2), 1.9%
Population
 • (2010) 67,103
 • Density 78/sq mi (30/km²)
Congressional district 18th
Time zone Central: UTC-6/-5
Website www.co.adams.il.us
Quincy, Illinois
Climate chart ()
J F M A M J J A S O N D
 
 
1.4
 
 
34
16
 
 
1.7
 
 
40
21
 
 
2.9
 
 
52
30
 
 
3.5
 
 
65
41
 
 
4.6
 
 
75
51
 
 
3.3
 
 
84
61
 
 
3.9
 
 
88
66
 
 
3.1
 
 
86
63
 
 
3.5
 
 
78
55
 
 
2.5
 
 
66
43
 
 
3.1
 
 
51
33
 
 
2.2
 
 
38
21
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel
J F M A M J J A S O N D
 
 
1.4
 
 
34
16
 
 
1.7
 
 
40
21
 
 
2.9
 
 
52
30
 
 
3.5
 
 
65
41
 
 
4.6
 
 
75
51
 
 
3.3
 
 
84
61
 
 
3.9
 
 
88
66
 
 
3.1
 
 
86
63
 
 
3.5
 
 
78
55
 
 
2.5
 
 
66
43
 
 
3.1
 
 
51
33
 
 
2.2
 
 
38
21
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel