Rock Island County, Illinois Explained

County:Rock Island County
State:Illinois
Founded:1831
Largest City Wl:Moline
Seat Wl:Rock Island
Area Total Sq Mi:451
Area Land Sq Mi:428
Area Water Sq Mi:24
Area Percentage:5.2
Population As Of:2020
Population Total:144672
Pop Est As Of:2023
Population Est:141236
Population Density Sq Mi:auto
Web:https://rockislandcountyil.gov/
Ex Image:Rock Island County Justice Center.jpg
Ex Image Cap:Rock Island County Justice Center
District:17th
Time Zone:Central

Rock Island County is a county located in the U.S. state of Illinois, bounded on the west by the Mississippi River. According to the 2020 census, it had a population of 144,672.[1] Its county seat is Rock Island; its largest city is neighboring Moline.[2] Rock Island County is one of the four counties that make up the Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area.[3]

History

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.[4] The Rock River (which the Sauk and Meskwaki peoples called Sinnissippi, meaning "rocky waters")[5] flows from Whiteside County and points further east and north and joins the Mississippi River at Rock Island. The Sinnissippi Mounds, dating from the Hopewell period and on the National Register of Historic Places are upriver at Sterling in Whiteside County.

Geography

According to the U.S. Census Bureau, the county has a total area of, of which is land and (5.2%) is water.

Climate and weather

In recent years, average temperatures in the county seat of Rock Island have ranged from a low of in January to a high of in July, although a record low of was recorded in February 1996 and a record high of was recorded in July 2006. Average monthly precipitation ranged from in January to in June.

Major highways

Transit

Adjacent counties

National protected area

Demographics

As of the 2010 United States Census, there were 147,546 people, 61,303 households, and 38,384 families residing in the county.[6] The population density was . There were 65,756 housing units at an average density of .[7] The racial makeup of the county was 81.6% white, 9.0% black or African American, 1.6% Asian, 0.3% American Indian, 4.4% from other races, and 3.0% from two or more races. Those of Hispanic or Latino origin made up 11.6% of the population. In terms of ancestry, 25.9% were German, 14.2% were Irish, 8.7% were English, 6.8% were Swedish, and 5.2% were American.[8]

Of the 61,303 households, 29.0% had children under the age of 18 living with them, 45.3% were married couples living together, 12.7% had a female householder with no husband present, 37.4% were non-families, and 31.6% of all households were made up of individuals. The average household size was 2.34 and the average family size was 2.93. The median age was 40.0 years.

The median income for a household in the county was $46,226 and the median income for a family was $58,962. Males had a median income of $42,548 versus $31,917 for females. The per capita income for the county was $25,071. About 8.7% of families and 12.3% of the population were below the poverty line, including 19.0% of those under age 18 and 7.1% of those age 65 or over.[9]

Economy

At one time Mississippi Valley Airlines had its headquarters in Quad City Airport in the county.[10] John Deere is headquartered in Moline.[11]

Communities

Cities

Villages

Census-designated places

Unincorporated communities

Townships

Rock Island County is divided into eighteen townships:

Forts

Politics

Before 1932, Rock Island County was a Republican stronghold in presidential elections, backing the party's candidate in every election from 1892 to 1928. From 1932 on, it has consistently backed Democratic Party presidential candidates, except for the national Republican landslides of 1952, 1956, 1972, and 1980. In 2016, Donald Trump managed to keep Hillary Clinton to a single-digit margin of victory, the first Republican to do so since Ronald Reagan in 1984; in 2020, Joe Biden increased the Democratic margin from 8.3% to 12.1%. Due to the dominance of the Democratic Party in county politics, Rock Island County remains one of the most Democratic counties outside of the Chicago area in Illinois. Since 2010 the Republican Party began making inroads in county politics, gaining a few seats on the Democratic-dominated county board; however, since 2018, the Republican Party influence on the board has begun to decrease as the county resumed heavy Democratic voting.[12]

See also

Further reading

External links

Notes and References

  1. Web site: Rock Island County, Illinois . June 10, 2023 . United States Census Bureau.
  2. Web site: Find a County . live . https://web.archive.org/web/20110531210815/http://www.naco.org/Counties/Pages/FindACounty.aspx . May 31, 2011 . June 7, 2011 . National Association of Counties.
  3. Web site: United States Office of Management and Budget . United States Office of Management and Budget . Update of Statistical Area Definitions and Guidance on Their Uses . dead . https://web.archive.org/web/20060514003222/http://www.whitehouse.gov/omb/bulletins/fy2006/b06-01.pdf . May 14, 2006 . July 21, 2006 . 5, 36.
  4. http://www.mvr.usace.army.mil/rockislandhistory/intro.htm Rock Island, the island, History: Introduction
  5. Web site: Castle Rock State Park . dead . https://web.archive.org/web/20070401200926/http://dnr.state.il.us/Lands/Landmgt/PARKS/R1/CASTLE.HTM . April 1, 2007 . August 3, 2014 . Illinois DNR.
  6. Web site: DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data . dead . https://archive.today/20200213023700/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_DP/DPDP1/0500000US17161 . February 13, 2020 . July 12, 2015 . United States Census Bureau.
  7. Web site: Population, Housing Units, Area, and Density: 2010 - County . dead . https://archive.today/20200212202956/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/GCTPH1.CY10/0500000US17161 . February 12, 2020 . July 12, 2015 . United States Census Bureau.
  8. Web site: DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates . dead . https://archive.today/20200213022459/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP02/0500000US17161 . February 13, 2020 . July 12, 2015 . United States Census Bureau.
  9. Web site: DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates . dead . https://archive.today/20200213012653/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP03/0500000US17161 . February 13, 2020 . July 12, 2015 . United States Census Bureau.
  10. "World Airline Directory." Flight International. March 30, 1985. 98 . "Head Office: PO Box 949, Quad City Airport, Moline, Illinois 61265, USA."
  11. Web site: Deere & Company World Headquarters . March 21, 2019.
  12. Web site: Rock Island County Clerk - Elections - Previous Election Results .