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Clark County, Illinois
Map of Illinois highlighting Clark County
Location in the state of Illinois
Map of the U.S. highlighting Illinois
Illinois's location in the U.S.
Founded 1819
Seat Marshall
Largest city Marshall
 - Total
 - Land
 - Water

505 sq mi (1,308 km²)
502 sq mi (1,299 km²)
3 sq mi (9 km²), 0.67%
 - (2000)
 - Density

34/sq mi (13/km²)
Time zone Central: UTC-6/-5

Clark County is a county located in the U.S. state of Illinois. As of 2000, the population is 17,008. The U.S. Census Bureau estimates the population to decrease by 0.6% from April 1, 2000 to July 1, 2004, to 16,906. Its county seat is Marshall6.


According to the U.S. Census Bureau, the county has a total area of 1,308 km² (505 sq mi). 1,299 km² (502 sq mi) of it is land and 9 km² (3 sq mi) of it (0.67%) is water.

Adjacent Counties[]


Clark County was formed in 1819 out of Crawford County. At the time of its formation, Clark County included about a third of Illinois. It acquired its present boundaries in 1831 as new counties were formed out of it.

Clark County was named for George Rogers Clark, an officer of the army of Virginia that captured the Northwest Territory from the British at the close of the Revolutionary War.


2000 census age pyramid for Clark County.

Historical populations
Census Pop.
1900 24,033
1910 23,517 −2.1%
1920 21,165 −10.0%
1930 17,872 −15.6%
1940 18,842 5.4%
1950 17,362 −7.9%
1960 16,546 −4.7%
1970 16,216 −2.0%
1980 16,913 4.3%
1990 15,921 −5.9%
2000 17,008 6.8%
IL Counties 1900-1990

As of the census2 of 2000, there were 17,008 people, 6,971 households, and 4,809 families residing in the county. The population density was 13/km² (34/sq mi). There were 7,816 housing units at an average density of 6/km² (16/sq mi). The racial makeup of the county was 98.78% White, 0.20% Black or African American, 0.18% Native American, 0.14% Asian, 0.03% Pacific Islander, 0.08% from other races, and 0.59% from two or more races. 0.32% of the population were Hispanic or Latino of any race.

There were 6,971 households out of which 31.20% had children under the age of 18 living with them, 56.90% were married couples living together, 8.70% had a female householder with no husband present, and 31.00% were non-families. 28.10% of all households were made up of individuals and 14.00% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.94.

In the county the population was spread out with 24.90% under the age of 18, 7.40% from 18 to 24, 26.60% from 25 to 44, 23.10% from 45 to 64, and 18.00% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 94.70 males. For every 100 females age 18 and over, there were 90.80 males.

The median income for a household in the county was $35,967, and the median income for a family was $43,213. Males had a median income of $32,035 versus $20,954 for females. The per capita income for the county was $17,655. About 6.40% of families and 9.20% of the population were below the poverty line, including 12.20% of those under age 18 and 7.50% of those age 65 or over.

Cities and towns[]


There are three school districts in Clark County (Marshall, Martinsville and Casey-Westfield) with a total enrollment (2004) of 3,014 students. Each district has one high school (grades 9-12) and one junior high school (grades 7-8). Marshall has two elementary schools and the other districts have one each.

See List of school districts in Clark County

Coordinates: 39°20′N 87°47′W / 39.33, -87.79

This page uses content from the English language Wikipedia. The original content was at Clark County, Illinois. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.