Rock Island County, Illinois

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Rock Island County, Illinois
Court house rock island IL postcard.jpg
Rock Island County Courthouse
Map of Illinois highlighting Rock Island County
Location in the 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 451.29 sq mi (1,169 km2)
 • Land 427.64 sq mi (1,108 km2)
 • Water 23.65 sq mi (61 km2), 5.24%
Population
 • (2010) 152,046
 • Density 350/sq mi (135/km²)
Congressional district 17th
Time zone Central: UTC-6/-5
Website www.co.rock-island.il.us

Rock Island County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 152,046, which is an increase of 1.8% from 149,374 in 2000.[1] Its county seat is Rock Island.[2]

Rock Island County is one of the four counties that make up the Davenport-Moline-Rock Island Metropolitan Statistical Area.[3]

Geography[edit]

According to the 2010 census, the county has a total area of 451.29 square miles (1,168.8 km2), of which 427.64 square miles (1,107.6 km2) (or 94.76%) is land and 23.65 square miles (61.3 km2) (or 5.24%) is water.[4]

Major highways[edit]

Townships[edit]

Andalusia, Blackhawk, Bowling, Buffalo Prairie, Canoe Creek, Coal Valley, Coe, Cordova, Drury, Edgington, Hampton, Milan,East Moline, Moline, Port Byron, Rock Island, Rural, Silvis, South Moline, South Rock Island, Zuma

Adjacent counties[edit]

National protected area[edit]

History[edit]

Rock Island County was formed in 1831 out of Jo Daviess County. It was named for Rock Island, an island in the Mississippi River now known as Arsenal Island.[5]

Demographics[edit]

Historical population
Census Pop.
1840 2,610
1850 6,937 165.8%
1860 21,005 202.8%
1870 29,783 41.8%
1880 38,302 28.6%
1890 41,917 9.4%
1900 55,249 31.8%
1910 70,404 27.4%
1920 92,297 31.1%
1930 98,191 6.4%
1940 113,323 15.4%
1950 133,558 17.9%
1960 150,991 13.1%
1970 166,734 10.4%
1980 165,968 −0.5%
1990 148,723 −10.4%
2000 149,374 0.4%
2010 152,046 1.8%
Est. 2012 153,257 0.8%
U.S. Decennial Census[6]
2012 Estimate[7]

As of the census of 2000, there were 149,374 people, 60,712 households, and 39,159 families residing in the county. The population density was 350 people per square mile (135/km²). There were 64,489 housing units at an average density of 151 per square mile (58/km²). The racial makeup of the county was 85.52% White, 7.54% Black or African American, 0.27% Native American, 1.02% Asian American, 0.03% Pacific Islander, 3.76% from other races, and 1.86% from two or more races. 8.56% of the population were Hispanic or Latino of any race. 23.1% were of German, 10.3% Irish, 8.4% American, 7.2% English, 6.6% Swedish and 5.5% Belgian ancestry.

There were 60,712 households out of which 28.90% had children under the age of 18 living with them, 49.10% were married couples living together, 11.60% had a female householder with no husband present, and 35.50% were non-families. 30.20% of all households were made up of individuals and 12.50% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.97.

In the county the population was spread out with 23.80% under the age of 18, 10.00% from 18 to 24, 27.30% from 25 to 44, 23.80% from 45 to 64, and 15.10% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 94.40 males. For every 100 females age 18 and over, there were 91.40 males.

The median income for a household in the county was $38,608, and the median income for a family was $47,956. Males had a median income of $35,998 versus $24,234 for females. The per capita income for the county was $20,164. About 8.10% of families and 10.70% of the population were below the poverty line, including 15.70% of those under age 18 and 6.80% of those age 65 or over.

Economy[edit]

At one time Mississippi Valley Airlines had its headquarters in Quad City Airport in the county.[8]

Cities and towns[edit]

Townships[edit]

Rock Island County is divided into these eighteen townships:

Climate and weather[edit]

Rock Island, Illinois
Climate chart (explanation)
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[9]

In recent years, average temperatures in the county seat of Rock Island have ranged from a low of 13 °F (−11 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −22 °F (−30 °C) was recorded in February 1996 and a record high of 103 °F (39 °C) was recorded in July 2006. Average monthly precipitation ranged from 1.28 inches (33 mm) in January to 4.75 inches (121 mm) in June.[9]

See also[edit]

Footnotes[edit]

  1. ^ "Rock Island County QuickFacts". United States Census Bureau. Retrieved 2011-11-05. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ United States Office of Management and Budget. "Update of Statistical Area Definitions and Guidance on Their Uses" (PDF). pp. 5, 36. Archived from the original on 2006-05-14. Retrieved 2006-07-21. 
  4. ^ "Census 2010 U.S. Gazetteer Files: Counties". United States Census. Retrieved 2011-11-05. 
  5. ^ Rock Island, the island, History: Introduction
  6. ^ "U.S. Decennial Census". Census.gov. Retrieved July 28, 2013. 
  7. ^ "Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2012". Census.gov. Retrieved July 28, 2013. 
  8. ^ "World Airline Directory." Flight International. March 30, 1985. 98. "Head Office: PO Box 949, Quad City Airport, Moline, Illinois 61265, USA."
  9. ^ a b "Monthly Averages for Rock Island, Illinois". The Weather Channel. Retrieved 2011-01-27. 

Further reading[edit]

External links[edit]

Coordinates: 41°28′N 90°34′W / 41.47°N 90.57°W / 41.47; -90.57