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Rock Island County

Rock Island County, Illinois
Rock Island County Courthouse - Rock Island, Illinois.JPG
Rock Island County Courthouse
Map of Illinois highlighting Rock Island County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded 1831
Seat Rock Island
Largest city Moline
Area
 • Total 451 sq mi (1,168 km2)
 • Land 428 sq mi (1,109 km2)
 • Water 24 sq mi (62 km2), 5.2%
Population
 • (2010) 147,546
 • Density 345/sq mi (133/km²)
Congressional district 17th
Time zone Central: UTC-6/-5
Website www.co.rock-island.il.us
Rock Island, Illinois
Climate chart ()
J F M A M J J A S O N D
 
 
1.3
 
 
30
13
 
 
1.4
 
 
36
19
 
 
2.6
 
 
48
29
 
 
3.6
 
 
61
41
 
 
4.4
 
 
72
52
 
 
4.8
 
 
81
63
 
 
3
 
 
85
68
 
 
4.3
 
 
83
66
 
 
2.9
 
 
76
57
 
 
2.4
 
 
65
45
 
 
2.5
 
 
48
32
 
 
1.9
 
 
35
20
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
 
 
1.3
 
 
30
13
 
 
1.4
 
 
36
19
 
 
2.6
 
 
48
29
 
 
3.6
 
 
61
41
 
 
4.4
 
 
72
52
 
 
4.8
 
 
81
63
 
 
3
 
 
85
68
 
 
4.3
 
 
83
66
 
 
2.9
 
 
76
57
 
 
2.4
 
 
65
45
 
 
2.5
 
 
48
32
 
 
1.9
 
 
35
20
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel