Clinton County, Illinois


Clinton County is a county located in the U.S. state of Illinois. At the 2020 census, the population was 36,899. Its county seat is Carlyle. In 1960, the United States Census Bureau placed the mean center of U.S. population in Clinton County. Clinton County is part of the St. Louis, MO-IL Metropolitan Statistical Area.
WWW clintonco.illinois.gov

History

In 1805, prior to the establishment of the county, the territorial government established a post road from its capital to St. Louis, Missouri, passing through the county.
In 1808 a wagon road was laid out through the future Clinton County. It extended from the Goshen Settlement to the Ohio salt works and crossed the Kaskaskia River at Carlyle. Clinton County became the home to early settlers by 1814, when the first land entries were made.
Clinton County was created on December 27, 1824, from portions of Washington, Fayette, and Bond Counties. It was named for the seventh governor of New York, DeWitt Clinton, who helped build the Erie Canal.
Crossing the Kaskaskia became much easier when the bridge now known as the General Dean Suspension Bridge was built in 1859, at a cost of $40,000. Before the bridge was constructed, crossings involved a ferry or a mud bridge. The Illinois General Assembly set aside $20,000 for bridge restoration in 1951, and in 1953 the bridge was named after William F. Dean.

Geography

According to the U.S. Census Bureau, the county has a total area of, of which is land and is water. Eldon Hazlet State Recreation Area and South Shore State Park are in Clinton County. Its southern border is the Kaskaskia River.

Climate and weather

In recent years, average temperatures in the county seat of Carlyle have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1994 and a record high of was recorded in July 1980. Average monthly precipitation ranged from in January to in June.

Transit

Major highways

Adjacent counties

Demographics

2020 census

As of the 2020 census, the county had a population of 36,899. The median age was 41.3 years. 21.8% of residents were under the age of 18 and 18.2% of residents were 65 years of age or older. For every 100 females there were 106.6 males, and for every 100 females age 18 and over there were 106.5 males age 18 and over.
The racial makeup of the county was 89.7% White, 3.1% Black or African American, 0.3% American Indian and Alaska Native, 0.5% Asian, <0.1% Native Hawaiian and Pacific Islander, 2.1% from some other race, and 4.3% from two or more races. Hispanic or Latino residents of any race comprised 3.8% of the population.
19.8% of residents lived in urban areas, while 80.2% lived in rural areas.
There were 14,258 households in the county, of which 30.0% had children under the age of 18 living in them. Of all households, 55.1% were married-couple households, 16.5% were households with a male householder and no spouse or partner present, and 21.9% were households with a female householder and no spouse or partner present. About 26.9% of all households were made up of individuals and 13.1% had someone living alone who was 65 years of age or older.
There were 15,574 housing units, of which 8.4% were vacant. Among occupied housing units, 79.6% were owner-occupied and 20.4% were renter-occupied. The homeowner vacancy rate was 1.5% and the rental vacancy rate was 7.2%.

2010 census

As of the 2010 United States census, there were 37,762 people, 14,005 households, and 9,760 families residing in the county. The population density was. There were 15,311 housing units at an average density of. The racial makeup of the county was 93.4% white, 3.5% black or African American, 0.4% Asian, 0.2% American Indian, 1.2% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 2.8% of the population. In terms of ancestry, 54.8% were German, 9.8% were Irish, 5.8% were English, and 5.6% were American.
Of the 14,005 households, 32.7% had children under the age of 18 living with them, 56.5% were married couples living together, 8.7% had a female householder with no husband present, 30.3% were non-families, and 25.1% of all households were made up of individuals. The average household size was 2.55 and the average family size was 3.02. The median age was 39.3 years.
The median income for a household in the county was $55,278 and the median income for a family was $66,682. Males had a median income of $45,119 versus $34,051 for females. The per capita income for the county was $25,392. About 5.2% of families and 7.8% of the population were below the poverty line, including 9.2% of those under age 18 and 5.7% of those age 65 or over.

Education

Communities

Cities

Villages

Townships

Unincorporated communities

Politics

As of February 2025, the county is one of seven that voted to join the state of Indiana.