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Rock Island County, Illinois

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Parent: Moline, Illinois Hop 4
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Rock Island County, Illinois
CountyRock Island County
StateIllinois
Founded1831
SeatRock Island
Largest cityMoline
Area total sq mi451
Area land sq mi427
Area water sq mi24
Area percentage5.3%
Census estimate yr2023
Pop144,672
Density sq mi339
Time zoneCentral
Webwww.rockislandcounty.org
District17th

Rock Island County, Illinois is a county located in the northwestern part of the state, along the Mississippi River. It is part of the Quad Cities metropolitan area, which includes neighboring Davenport and Bettendorf. The county seat is Rock Island, though its largest city is Moline, home to the global headquarters of Deere & Company.

History

The region's history is deeply tied to the Mississippi River and early conflicts between indigenous nations and American settlers. The area was originally inhabited by the Sauk and Meskwaki peoples, with the pivotal Battle of Credit Island occurring nearby in 1814 during the War of 1812. The establishment of Fort Armstrong in 1816 on what is now Arsenal Island secured American military presence. The Black Hawk Purchase of 1832, following the Black Hawk War, opened the land for widespread settlement, leading to the county's official organization in 1831. The 19th century saw rapid growth with the arrival of the Chicago, Rock Island and Pacific Railroad and the development of the Rock Island Arsenal, a major military manufacturing facility. The county was a significant hub during the Lincoln-Douglas debates and later for the Progressive Era labor movement, including events surrounding the 1914 Ludlow Massacre.

Geography

According to the U.S. Census Bureau, the county has a total area of 451 square miles, of which 427 square miles is land and 24 square miles is water. Its western border is defined by the Mississippi River, separating it from Scott County, Iowa. The Rock River flows through the county before joining the Mississippi at the city of Rock Island. The landscape features rolling terrain, bluffs along the river, and fertile bottomland. Major geographic features include the Hennepin Canal and Loud Thunder Forest Preserve. The county is part of the Driftless Area, a region that escaped glaciation during the last ice age.

Demographics

As of the 2020 U.S. census, the population was 144,672. The racial makeup was predominantly Non-Hispanic White, with significant African American and Hispanic or Latino communities. The largest ancestry groups include German, Irish, and English. The population is concentrated in the Quad Cities urban core, with smaller communities like Coal Valley and Port Byron. Historical population peaks were influenced by manufacturing booms at the Rock Island Arsenal and International Harvester plants.

Government

Rock Island County operates under a board system, with elected members including a chairman. It is part of Illinois's 17th congressional district, represented in the U.S. House. The county contains multiple state senate and house districts. Key county-wide elected officials include the Sheriff, State's Attorney, and County Clerk. The county government oversees major facilities like the Rock Island County Courthouse and the Rock Island County Jail.

Economy

The economy has historically been anchored by manufacturing and agriculture. Deere & Company, headquartered in Moline, is a global leader in agricultural equipment. The Rock Island Arsenal remains a critical employer for defense manufacturing. Other significant sectors include healthcare, led by institutions like Genesis Health System, logistics and transportation leveraging the Mississippi River and Interstate 80, and retail. The Quad Cities International Airport and the presence of Amazon and Alcoa facilities contribute to the modern economic base.

Education

Higher education is served by Augustana College, a private liberal arts institution, and Black Hawk College, a public community college. Public primary and secondary education is managed by several districts, including Rock Island-Milan School District and Moline-Coal Valley School District. Notable private schools include Alleman High School and Jordan Catholic School. The county is also home to the Augustana College Library and the Rock Island Public Library system.

Transportation

Major highways include Interstate 80, Interstate 74, and Interstate 280. The Quad Cities International Airport provides commercial air service. Rail freight is handled by the former Chicago, Rock Island and Pacific Railroad lines, now primarily operated by the Iowa Interstate Railroad. Public transit is provided by the MetroLINK system, which serves the Quad Cities region. The Centennial Bridge and the I-74 Mississippi River Bridge are vital connections to Iowa.

Category:Illinois counties Category:Quad Cities Category:1831 establishments in Illinois