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Sangamon County

Sangamon County, Illinois
Seal of Sangamon County, Illinois
Seal
Map of Illinois highlighting Sangamon County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded 1821
Named for Sangamon River
Seat Springfield
Largest city Springfield
Area
 • Total 877 sq mi (2,271 km2)
 • Land 868 sq mi (2,248 km2)
 • Water 8.7 sq mi (23 km2), 1.0%
Population
 • (2010) 197,465
 • Density 227/sq mi (88/km²)
Congressional districts 13th, 18th
Website www.co.sangamon.il.us
Springfield, Illinois
Climate chart ()
J F M A M J J A S O N D
 
 
1.6
 
 
33
17
 
 
1.8
 
 
39
22
 
 
3.2
 
 
51
32
 
 
3.4
 
 
63
42
 
 
4.1
 
 
74
53
 
 
3.8
 
 
83
62
 
 
3.5
 
 
87
66
 
 
3.4
 
 
85
64
 
 
2.8
 
 
79
55
 
 
2.6
 
 
67
44
 
 
2.9
 
 
51
34
 
 
2.5
 
 
38
23
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
 
 
1.6
 
 
33
17
 
 
1.8
 
 
39
22
 
 
3.2
 
 
51
32
 
 
3.4
 
 
63
42
 
 
4.1
 
 
74
53
 
 
3.8
 
 
83
62
 
 
3.5
 
 
87
66
 
 
3.4
 
 
85
64
 
 
2.8
 
 
79
55
 
 
2.6
 
 
67
44
 
 
2.9
 
 
51
34
 
 
2.5
 
 
38
23
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel