Rock Island County, Illinois


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. Its county seat is Rock Island; its largest city is neighboring Moline. Rock Island County is one of the four counties that make up the Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area.

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. The Rock River 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 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

2020 census

As of the 2020 census, the county had a population of 144,672. The median age was 40.6 years. 22.1% of residents were under the age of 18 and 19.9% of residents were 65 years of age or older. For every 100 females there were 96.8 males, and for every 100 females age 18 and over there were 94.6 males age 18 and over.
The racial makeup of the county was 71.2% White, 11.5% Black or African American, 0.5% American Indian and Alaska Native, 2.8% Asian, <0.1% Native Hawaiian and Pacific Islander, 5.2% from some other race, and 8.8% from two or more races. Hispanic or Latino residents of any race comprised 13.7% of the population.
The 2020 census counted 88.5% of residents living in urban areas and 11.5% living in rural areas.
There were 60,735 households in the county, of which 27.4% had children under the age of 18 living in them. Of all households, 42.1% were married-couple households, 20.6% were households with a male householder and no spouse or partner present, and 30.0% were households with a female householder and no spouse or partner present. About 33.5% of all households were made up of individuals and 14.7% had someone living alone who was 65 years of age or older.
There were 66,729 housing units, of which 9.0% were vacant. Among occupied housing units, 66.4% were owner-occupied and 33.6% were renter-occupied. The homeowner vacancy rate was 2.1% and the rental vacancy rate was 10.7%.

2010 census

As of the 2010 United States census, there were 147,546 people, 61,303 households, and 38,384 families residing in the county. The population density was. There were 65,756 housing units at an average density of. 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.
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.

Economy

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

Communities

Cities

Villages

Census-designated places

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.

Education

K-12 school districts include:
There is one secondary school district: United [Township High School District 30].
Elementary school districts include: