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{{Short description|County in Illinois, United States}} {{Redirect-distinguish|Rock Island County|Rock Island Township (disambiguation){{!}}Rock Island Township}} {{Use mdy dates|date=April 2024}} {{Infobox U.S. county | county = Rock Island County | state = Illinois | seal = | logo = Rock Island County, Illinois logo.jpg | 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 {{decrease}} | 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 | named for = [[Rock Island Arsenal|Rock (Arsenal) Island]] }} '''Rock Island County''' is a [[County (United States)|county]] located in the [[U.S. state]] of [[Illinois]], bounded on the west by the [[Mississippi River]]. According to the [[2020 United States census|2020 census]], it had a population of 144,672.<ref>{{Cite web |title=Rock Island County, Illinois |url=https://data.census.gov/profile/Rock_Island_County,_Illinois?g=050XX00US17161 |access-date=June 10, 2023 |publisher=[[United States Census Bureau]]}}</ref> Its [[county seat]] is [[Rock Island, Illinois|Rock Island]]; its largest city is neighboring [[Moline, Illinois|Moline]].<ref name="GR6">{{Cite web |title=Find a County |url=http://www.naco.org/Counties/Pages/FindACounty.aspx |url-status=live |archive-url=https://web.archive.org/web/20110531210815/http://www.naco.org/Counties/Pages/FindACounty.aspx |archive-date=May 31, 2011 |access-date=June 7, 2011 |publisher=National Association of Counties}}</ref> Rock Island County is one of the four counties that make up the [[Davenport, Iowa|Davenport]]-[[Moline, Illinois|Moline]]-Rock Island, [[Iowa|IA]]-IL [[Quad Cities|Metropolitan Statistical Area]].<ref>{{Cite web |last=United States Office of Management and Budget |author-link=United States Office of Management and Budget |title=Update of Statistical Area Definitions and Guidance on Their Uses |url=https://www.whitehouse.gov/omb/bulletins/fy2006/b06-01.pdf |url-status=dead |archive-url=https://web.archive.org/web/20060514003222/http://www.whitehouse.gov/omb/bulletins/fy2006/b06-01.pdf <!-- Bot retrieved archive --> |archive-date=May 14, 2006 |access-date=July 21, 2006 |pages=5, 36}}</ref> ==History== [[File:Rock Island County Illinois 1831.png|thumb|Rock Island County at the time of its creation in 1831]] Rock Island County was formed in 1831 out of [[Jo Daviess County, Illinois|Jo Daviess County]]. It was named for Rock Island, an island in the [[Mississippi River]] now known as [[Arsenal Island]].<ref>[http://www.mvr.usace.army.mil/rockislandhistory/intro.htm Rock Island, the island, History: Introduction<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20090114083221/http://www.mvr.usace.army.mil/rockislandhistory/intro.htm |date=January 14, 2009 }}, US Army Corps of Engineers</ref> The [[Rock River (Mississippi River tributary)|Rock River]] (which the [[Sauk people|Sauk]] and [[Meskwaki]] peoples called '''Sinnissippi''', meaning "rocky waters")<ref>{{Cite web |title=Castle Rock State Park |url=http://dnr.state.il.us/lands/landmgt/parks/r1/castle.htm |url-status=dead |archive-url=https://web.archive.org/web/20070401200926/http://dnr.state.il.us/Lands/Landmgt/PARKS/R1/CASTLE.HTM |archive-date=April 1, 2007 |access-date=August 3, 2014 |publisher=[[Illinois|Illinois DNR]]}}</ref> 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, Illinois|Sterling]] in Whiteside County. ==Geography== According to the [[U.S. Census Bureau]], the county has a total area of {{convert|451|sqmi}}, of which {{convert|428|sqmi}} is land and {{convert|24|sqmi}} (5.2%) is water.<ref name="census-density" /> ===Climate and weather=== {{climate chart |[[Rock Island, Illinois]] |13|30|1.28 |19|36|1.41 |29|48|2.59 |41|61|3.64 |52|72|4.44 |63|81|4.75 |68|85|2.99 |66|83|4.31 |57|76|2.90 |45|65|2.39 |32|48|2.47 |20|35|1.93 |float=right |units=imperial |clear=both |source=The Weather Channel<ref name="weather">{{Cite web |title=Monthly Averages for Rock Island, Illinois |url=http://www.weather.com/weather/wxclimatology/monthly/graph/USIL1011 |url-status=live |archive-url=https://web.archive.org/web/20091112102554/http://www.weather.com/weather/wxclimatology/monthly/graph/USIL1011 |archive-date=November 12, 2009 |access-date=January 27, 2011 |publisher=The Weather Channel |df=mdy-all}}</ref>}} In recent years, average temperatures in the county seat of Rock Island have ranged from a low of {{convert|13|°F}} in January to a high of {{convert|85|°F}} in July, although a record low of {{convert|-22|°F}} was recorded in February 1996 and a record high of {{convert|103|°F}} was recorded in July 2006. Average monthly precipitation ranged from {{convert|1.28|in}} in January to {{convert|4.75|in}} in June.<ref name="weather" /> ===Major highways=== {{div col|colwidth=22em}} * [[Image:I-74.svg|20px]] [[Interstate 74]] * [[Image:I-80.svg|20px]] [[Interstate 80]] * [[Image:I-88.svg|20px]] [[Interstate 88 (west)|Interstate 88]] * [[Image:I-280.svg|20px]] [[Interstate 280 (Illinois–Iowa)|Interstate 280]] * [[Image:US 6.svg|20px]] [[U.S. Highway 6]] * [[Image:US 67.svg|20px]] [[U.S. Highway 67]] * [[Image:US 150.svg|20px]] [[U.S. Highway 150]] * [[Image:Illinois 2.svg|20px]] [[Illinois Route 2]] (formerly) * [[Image:Illinois 5.svg|20px]] [[Illinois Route 5]] * [[Image:Illinois 84.svg|20px]] [[Illinois Route 84]] * [[Image:Illinois 92.svg|20px]] [[Illinois Route 92]] * [[Image:Illinois 94.svg|20px]] [[Illinois Route 94]] * [[Image:Illinois 110.svg|20px]] [[Illinois Route 110]] * [[Image:Illinois 192.svg|20px]] [[Illinois Route 192]] {{div col end}} ===Transit=== * [[Quad Cities MetroLINK]] * [[List of intercity bus stops in Illinois]] ===Adjacent counties=== * [[Clinton County, Iowa|Clinton County]], [[Iowa]] (north) * [[Whiteside County, Illinois|Whiteside County]] (northeast) * [[Henry County, Illinois|Henry County]] (southeast) * [[Mercer County, Illinois|Mercer County]] (south) * [[Louisa County, Iowa|Louisa County]], [[Iowa]] (southwest) * [[Muscatine County, Iowa|Muscatine County]], [[Iowa]] (west) * [[Scott County, Iowa|Scott County]], [[Iowa]] (northwest) ===National protected area=== * [[Upper Mississippi River National Wildlife and Fish Refuge]] (part) ==Demographics== {{US Census population |1840= 2610 |1850= 6937 |1860= 21005 |1870= 29783 |1880= 38302 |1890= 41917 |1900= 55249 |1910= 70404 |1920= 92297 |1930= 98191 |1940= 113323 |1950= 133558 |1960= 150991 |1970= 166734 |1980= 165968 |1990= 148723 |2000= 149374 |2010= 147546 |2020= 144672 |estyear=2023 |estimate=141236 |estref=<ref name="USCensusEst2023">{{Cite web |title=Annual Estimates of the Resident Population for Counties: April 1, 2020 to July 1, 2023 |url=https://www.census.gov/programs-surveys/popest/data/tables.html |access-date=April 2, 2024 |publisher=United States Census Bureau}}</ref> |align-fn=center |footnote=U.S. Decennial Census<ref>{{Cite web |title=U.S. Decennial Census |url=https://www.census.gov/programs-surveys/decennial-census.html |access-date=July 8, 2014 |publisher=United States Census Bureau}}</ref><br />1790-1960<ref>{{Cite web |title=Historical Census Browser |url=http://mapserver.lib.virginia.edu |url-status=live |archive-url=https://web.archive.org/web/20120811110448/http://mapserver.lib.virginia.edu/ |archive-date=August 11, 2012 |access-date=July 8, 2014 |publisher=University of Virginia Library}}</ref> 1900-1990<ref>{{Cite web |title=Population of Counties by Decennial Census: 1900 to 1990 |url=https://www.census.gov/population/cencounts/il190090.txt |url-status=live |archive-url=https://web.archive.org/web/20140424084443/http://www.census.gov/population/cencounts/il190090.txt |archive-date=April 24, 2014 |access-date=July 8, 2014 |publisher=United States Census Bureau}}</ref><br />1990-2000<ref>{{Cite web |title=Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000 |url=https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |url-status=live |archive-url=https://web.archive.org/web/20141218203824/http://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-date=December 18, 2014 |access-date=July 8, 2014 |publisher=United States Census Bureau}}</ref> 2010<ref name="QF">{{Cite web |title=State & County QuickFacts |url=http://quickfacts.census.gov/qfd/states/17/17161.html |url-status=live |archive-url=https://web.archive.org/web/20110607104540/http://quickfacts.census.gov/qfd/states/17/17161.html |archive-date=June 7, 2011 |access-date=July 8, 2014 |publisher=United States Census Bureau}}</ref> }} As of the [[2010 United States census]], there were 147,546 people, 61,303 households, and 38,384 families residing in the county.<ref name="census-dp1">{{Cite web |title=DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data |url=http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_DP/DPDP1/0500000US17161 |url-status=dead |archive-url=https://archive.today/20200213023700/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_DP/DPDP1/0500000US17161 |archive-date=February 13, 2020 |access-date=July 12, 2015 |publisher=[[United States Census Bureau]]}}</ref> The population density was {{convert|345.0|PD/sqmi}}. There were 65,756 housing units at an average density of {{convert|153.8|/sqmi}}.<ref name="census-density">{{Cite web |title=Population, Housing Units, Area, and Density: 2010 - County |url=http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/GCTPH1.CY10/0500000US17161 |url-status=dead |archive-url=https://archive.today/20200212202956/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/GCTPH1.CY10/0500000US17161 |archive-date=February 12, 2020 |access-date=July 12, 2015 |publisher=[[United States Census Bureau]]}}</ref> 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.<ref name="census-dp1" /> In terms of ancestry, 25.9% were [[Germans|German]], 14.2% were [[Irish people|Irish]], 8.7% were [[English people|English]], 6.8% were [[Swedes|Swedish]], and 5.2% were [[Americans|American]].<ref name="census-dp2">{{Cite web |title=DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates |url=http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP02/0500000US17161 |url-status=dead |archive-url=https://archive.today/20200213022459/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP02/0500000US17161 |archive-date=February 13, 2020 |access-date=July 12, 2015 |publisher=[[United States Census Bureau]]}}</ref> 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.<ref name="census-dp1" /> 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.<ref name="census-dp3">{{Cite web |title=DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates |url=http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP03/0500000US17161 |url-status=dead |archive-url=https://archive.today/20200213012653/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP03/0500000US17161 |archive-date=February 13, 2020 |access-date=July 12, 2015 |publisher=[[United States Census Bureau]]}}</ref> ==Economy== At one time [[Mississippi Valley Airlines]] had its headquarters in [[Quad City Airport]] in the county.<ref>"World Airline Directory." ''[[Flight International]]''. March 30, 1985. [http://www.flightglobal.com/pdfarchive/view/1985/1985%20-%200958.html?search=%22Muse%20Air%22 98] {{webarchive|url=https://web.archive.org/web/20130223003321/http://www.flightglobal.com/pdfarchive/view/1985/1985%20-%200958.html?search=%22Muse%20Air%22 |date=February 23, 2013 }}. "Head Office: PO Box 949, Quad City Airport, Moline, Illinois 61265, USA."</ref> [[John Deere]] is headquartered in Moline.<ref>{{Cite web |title=Deere & Company World Headquarters |url=https://www.deere.com/en/our-company/john-deere-careers/interview-resources/moline-world-headquarters/ |access-date=March 21, 2019}}</ref> ==Communities== ===Cities=== * [[East Moline, Illinois|East Moline]] * [[Moline, Illinois|Moline]] * [[Rock Island, Illinois|Rock Island]] * [[Silvis, Illinois|Silvis]] ===Villages=== {{div col|colwidth=22em}} * [[Andalusia, Illinois|Andalusia]] * [[Carbon Cliff, Illinois|Carbon Cliff]] * [[Coal Valley, Illinois|Coal Valley]] (part) * [[Cordova, Illinois|Cordova]] * [[Hampton, Illinois|Hampton]] * [[Hillsdale, Illinois|Hillsdale]] * [[Milan, Illinois|Milan]] * [[Oak Grove, Illinois|Oak Grove]] * [[Port Byron, Illinois|Port Byron]] * [[Rapids City, Illinois|Rapids City]] * [[Reynolds, Illinois|Reynolds]] (part) {{div col end}} ===Census-designated places=== * [[Coyne Center, Illinois|Coyne Center]] * [[Rock Island Arsenal, Illinois|Rock Island Arsenal]] ===Unincorporated communities=== * [[Barstow, Illinois|Barstow]] * [[Buffalo Prairie, Illinois|Buffalo Prairie]] * [[Campbell's Island (Illinois)|Campbell's Island]] * [[Edgington, Illinois|Edgington]] * [[Illinois City, Illinois|Illinois City]] * [[Joslin, Illinois|Joslin]] * [[Taylor Ridge, Illinois|Taylor Ridge]] ===Townships=== Rock Island County is divided into eighteen [[Civil township|townships]]: {{div col|colwidth=22em}} * [[Andalusia Township, Rock Island County, Illinois|Andalusia]] * [[Blackhawk Township, Rock Island County, Illinois|Blackhawk]] * [[Bowling Township, Rock Island County, Illinois|Bowling]] * [[Buffalo Prairie Township, Rock Island County, Illinois|Buffalo Prairie]] * [[Canoe Creek Township, Rock Island County, Illinois|Canoe Creek]] * [[Coal Valley Township, Rock Island County, Illinois|Coal Valley]] * [[Coe Township, Rock Island County, Illinois|Coe]] * [[Cordova Township, Rock Island County, Illinois|Cordova]] * [[Drury Township, Rock Island County, Illinois|Drury]] * [[Edgington Township, Rock Island County, Illinois|Edgington]] * [[Hampton Township, Rock Island County, Illinois|Hampton]] * [[Moline Township, Rock Island County, Illinois|Moline]] * [[Port Byron Township, Rock Island County, Illinois|Port Byron]] * [[Rock Island Township, Rock Island County, Illinois|Rock Island]] * [[Rural Township, Rock Island County, Illinois|Rural]] * [[South Moline Township, Rock Island County, Illinois|South Moline]] * [[South Rock Island Township, Rock Island County, Illinois|South Rock Island]] * [[Zuma Township, Rock Island County, Illinois|Zuma]] ===Forts=== * [[Fort Armstrong (Illinois)|Fort Armstrong]] {{div col end}} ==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.<ref>{{Cite web |title=Rock Island County Clerk - Elections - Previous Election Results |url=https://www.rockislandcounty.org/PreviousElections/}}</ref> {{PresHead|place=Rock Island County, Illinois|source=<ref>{{Cite web |last=Leip |first=David |title=Dave Leip's Atlas of U.S. Presidential Elections |url=http://uselectionatlas.org/RESULTS |url-status=live |archive-url=https://web.archive.org/web/20180323225526/https://uselectionatlas.org/RESULTS/ |archive-date=March 23, 2018 |access-date=May 6, 2018 |website=uselectionatlas.org}}</ref>}} <!-- PresRow should be {{PresRow|Year|Winning party|GOP vote #|Dem vote #|3rd party vote #|State}} --> {{PresRow|2024|Democratic|28,061|34,126|1,492|Illinois}} {{PresRow|2020|Democratic|28,603|36,691|1,653|Illinois}} {{PresRow|2016|Democratic|26,998|32,298|4,698|Illinois}} {{PresRow|2012|Democratic|24,934|39,157|1,126|Illinois}} {{PresRow|2008|Democratic|25,364|42,210|1,034|Illinois}} {{PresRow|2004|Democratic|29,663|39,880|429|Illinois}} {{PresRow|2000|Democratic|25,194|37,957|1,944|Illinois}} {{PresRow|1996|Democratic|20,626|34,822|5,507|Illinois}} {{PresRow|1992|Democratic|23,212|37,412|11,415|Illinois}} {{PresRow|1988|Democratic|27,412|40,174|315|Illinois}} {{PresRow|1984|Democratic|35,121|40,208|343|Illinois}} {{PresRow|1980|Republican|34,788|30,045|6,942|Illinois}} {{PresRow|1976|Democratic|34,007|35,994|1,260|Illinois}} {{PresRow|1972|Republican|37,548|32,529|253|Illinois}} {{PresRow|1968|Democratic|30,404|34,506|5,230|Illinois}} {{PresRow|1964|Democratic|23,714|41,759|0|Illinois}} {{PresRow|1960|Democratic|32,534|33,812|108|Illinois}} {{PresRow|1956|Republican|31,342|29,145|118|Illinois}} {{PresRow|1952|Republican|32,933|27,879|100|Illinois}} {{PresRow|1948|Democratic|22,192|24,542|477|Illinois}} {{PresRow|1944|Democratic|23,980|30,102|180|Illinois}} {{PresRow|1940|Democratic|25,629|35,240|232|Illinois}} {{PresRow|1936|Democratic|19,487|32,741|799|Illinois}} {{PresRow|1932|Democratic|21,205|24,676|668|Illinois}} {{PresRow|1928|Republican|27,246|14,334|196|Illinois}} {{PresRow|1924|Republican|20,563|3,631|11,453|Illinois}} {{PresRow|1920|Republican|21,908|5,208|3,603|Illinois}} {{PresRow|1916|Republican|16,169|10,914|3,327|Illinois}} {{PresRow|1912|Republican|6,506|3,997|4,786|Illinois}} {{PresRow|1908|Republican|8,196|4,739|1,846|Illinois}} {{PresRow|1904|Republican|8,152|2,156|2,895|Illinois}} {{PresRow|1900|Republican|8,299|4,786|471|Illinois}} {{PresRow|1896|Republican|7,323|4,692|176|Illinois}} {{PresFoot|1892|Republican|5,052|4,034|559|Illinois}} ==See also== * [[National Register of Historic Places listings in Rock Island County, Illinois]] * [[Quad Cities International Airport]] ==Footnotes== {{Reflist|2}} ==Further reading== * [https://archive.org/details/portraitbiograph00biogr ''Portrait and Biographical Album of Rock Island County, Illinois: Containing Full-Page Portraits and Biographical Sketches of Prominent and Representative Citizens of the County, Together with Portraits and Biographies of All the Governors of Illinois, and of the Presidents of the United States; Also Containing a History of the County, from its Earliest Settlement to the Present Time.''] Chicago: Biographical Publishing Co., 1885. ==External links== * [https://rockislandcountyil.gov/ Official county website] * [http://www.richs.cc/ Rock Island County Historical Society] {{Geographic Location |Centre = Rock Island County, Illinois |North = [[Clinton County, Iowa]] |Northeast = [[Whiteside County, Illinois|Whiteside County]] |East = |Southeast = [[Henry County, Illinois|Henry County]] |South = [[Mercer County, Illinois|Mercer County]] |Southwest = [[Louisa County, Iowa]] |West = [[Muscatine County, Iowa]] |Northwest = [[Scott County, Iowa]] }} {{Rock Island County, Illinois}} {{Quad Cities}} {{Illinois}} {{Authority control}} {{Coord|41.47|-90.57|display=title|type:adm2nd_region:US-IL_source:UScensus1990}} [[Category:Rock Island County, Illinois| ]] [[Category:Illinois counties]] [[Category:1831 establishments in Illinois]] [[Category:Populated places established in 1831]] [[Category:Quad Cities]] [[Category:Illinois counties on the Mississippi River]]
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