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Johnson County, Illinois
Map of Illinois highlighting Johnson County
Location in the state of Illinois
Map of the U.S. highlighting Illinois
Illinois's location in the U.S.
Founded 1812
Seat Vienna
Largest city Vienna
 - Total
 - Land
 - Water

349 sq mi (904 km²)
345 sq mi (893 km²)
4 sq mi (11 km²), 1.22%
 - (2000)
 - Density

37/sq mi (14/km²)
Time zone Central: UTC-6/-5

Johnson County is a county located in the U.S. state of Illinois. As of 2000, the population is 12,878. Its county seat is Vienna6.


According to the U.S. Census Bureau, the county has a total area of 904 km² (349 sq mi). 893 km² (345 sq mi) of it is land and 11 km² (4 sq mi) of it (1.22%) is water.

Adjacent Counties[]


Johnson County was organized in 1812 out of Randolph County. It was named for Richard M. Johnson, who was then a U.S. Congressman from Kentucky. In 1813, Johnson commanded a Kentucky regiment at the Battle of the Thames, after which he claimed to have killed Tecumseh in hand to hand combat. Johnson went on to be Vice President of the United States.


2000 census age pyramid for Johnson County, skewed toward male because of the Vienna Correctional Center, an Illinois State Prison for men.[1]

Historical populations
Census Pop.
1900 15,667
1910 14,331 −8.5%
1920 12,022 −16.1%
1930 10,203 −15.1%
1940 10,727 5.1%
1950 8,729 −18.6%
1960 6,928 −20.6%
1970 7,550 9.0%
1980 9,624 27.5%
1990 11,347 17.9%
2000 12,878 13.5%
IL Counties 1900-1990

As of the census2 of 2000, there were 12,878 people, 4,183 households, and 3,053 families residing in the county. The population density was 14/km² (37/sq mi). There were 5,046 housing units at an average density of 6/km² (15/sq mi). The racial makeup of the county was 83.52% White, 14.17% Black or African American, 0.27% Native American, 0.13% Asian, 0.04% Pacific Islander, 1.07% from other races, and 0.79% from two or more races. 2.86% of the population were Hispanic or Latino of any race.

There were 4,183 households out of which 30.60% had children under the age of 18 living with them, 62.30% were married couples living together, 7.10% had a female householder with no husband present, and 27.00% were non-families. 24.20% of all households were made up of individuals and 12.10% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.87.

In the county the population was spread out with 18.30% under the age of 18, 11.40% from 18 to 24, 34.00% from 25 to 44, 22.70% from 45 to 64, and 13.60% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 149.00 males. For every 100 females age 18 and over, there were 160.20 males.

The median income for a household in the county was $33,326, and the median income for a family was $40,275. Males had a median income of $29,415 versus $22,844 for females. The per capita income for the county was $17,990. About 8.10% of families and 11.30% of the population were below the poverty line, including 11.30% of those under age 18 and 11.50% of those age 65 or over.

Cities and towns[]

Census designated places[]

Coordinates: 37°28′N 88°52′W / 37.46, -88.87

This page uses content from the English language Wikipedia. The original content was at Johnson 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.