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Marion County, Illinois

Marion County, Illinois
Marion County Courthouse in Salem.jpg
Marion County Courthouse in Salem
Map of Illinois highlighting Marion County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded 1823
Named for Francis Marion
Seat Salem
Largest city Centralia
Area
 • Total 576 sq mi (1,492 km2)
 • Land 572 sq mi (1,481 km2)
 • Water 3.7 sq mi (10 km2), 0.6%
Population
 • (2010) 39,437
 • Density 69/sq mi (27/km²)
Congressional district 15th
Time zone Central: UTC-6/-5
Salem, Illinois
Climate chart ()
J F M A M J J A S O N D
 
 
2.5
 
 
37
18
 
 
2.5
 
 
43
22
 
 
4
 
 
54
33
 
 
4
 
 
65
44
 
 
4.4
 
 
75
54
 
 
4.2
 
 
84
63
 
 
3.9
 
 
88
68
 
 
3.4
 
 
87
66
 
 
3.2
 
 
80
57
 
 
3.1
 
 
69
45
 
 
4.1
 
 
54
34
 
 
3.3
 
 
42
24
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
 
 
2.5
 
 
37
18
 
 
2.5
 
 
43
22
 
 
4
 
 
54
33
 
 
4
 
 
65
44
 
 
4.4
 
 
75
54
 
 
4.2
 
 
84
63
 
 
3.9
 
 
88
68
 
 
3.4
 
 
87
66
 
 
3.2
 
 
80
57
 
 
3.1
 
 
69
45
 
 
4.1
 
 
54
34
 
 
3.3
 
 
42
24
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel