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Clay County, Illinois
Map of Illinois highlighting Clay County
Location in the state of Illinois
Map of the U.S. highlighting Illinois
Illinois's location in the U.S.
Founded 1824
Seat Louisville
Largest city Flora
 - Total
 - Land
 - Water

470 sq mi (1,217 km²)
469 sq mi (1,215 km²)
1 sq mi (2 km²), 0.13%
 - (2000)
 - Density

31/sq mi (12/km²)
Time zone Central: UTC-6/-5

Clay County is a county located in the U.S. state of Illinois, and determined by the U.S. Census Bureau to include the mean center of U.S. population in 1950. As of 2000, the population was 14,560.

Clay County was formed in 1824 out of portions of Wayne, Crawford and Fayette Counties. Its name is in honor of Henry Clay, famous American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century. Its county seat is Louisville.


According to the U.S. Census Bureau, the county has a total area of 1,217 km² (470 sq mi). 1,215 km² (469 sq mi) of it is land and 2 km² (1 sq mi) of it (0.13%) is water.

Adjacent Counties[]


2000 census age pyramid for Clay County.

Historical populations
Census Pop.
1900 19,553
1910 18,661 −4.6%
1920 17,684 −5.2%
1930 16,155 −8.6%
1940 18,947 17.3%
1950 17,445 −7.9%
1960 15,815 −9.3%
1970 14,735 −6.8%
1980 15,283 3.7%
1990 14,460 −5.4%
2000 14,560 0.7%
IL Counties 1900-1990

As of the census2 of 2000, there were 14,560 people, 5,839 households, and 4,005 families residing in the county. The population density was 12/km² (31/sq mi). There were 6,394 housing units at an average density of 5/km² (14/sq mi). The racial makeup of the county was 98.52% White, 0.11% Black or African American, 0.23% Native American, 0.52% Asian, 0.01% Pacific Islander, 0.21% from other races, and 0.40% from two or more races. 0.60% of the population were Hispanic or Latino of any race.

There were 5,839 households out of which 30.60% had children under the age of 18 living with them, 56.40% were married couples living together, 8.60% had a female householder with no husband present, and 31.40% were non-families. 27.90% of all households were made up of individuals and 14.80% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.94.

In the county the population was spread out with 23.90% under the age of 18, 8.00% from 18 to 24, 25.90% from 25 to 44, 23.00% from 45 to 64, and 19.20% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 92.30 males. For every 100 females age 18 and over, there were 89.10 males.

The median income for a household in the county was $30,599, and the median income for a family was $36,675. Males had a median income of $27,813 versus $20,616 for females. The per capita income for the county was $15,771. About 9.00% of families and 11.80% of the population were below the poverty line, including 12.90% of those under age 18 and 12.30% of those age 65 or over.

Cities and towns[]

Coordinates: 38°46′N 88°29′W / 38.76, -88.49

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