Clay County, Illinois facts for kids

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Clay County, Illinois
Map

Location in the state of Illinois
Map of the USA highlighting Illinois
Illinois's location in the U.S.
Statistics
Founded 1824
Seat Louisville
Largest City Flora
Area
 - Total
 - Land
 - Water

470 sq mi (1,217 km²)
468 sq mi (1,212 km²)
1.3 sq mi (3 km²), 0.3%
Population
 - (2010)
 - Density

13,815
29/sq mi (11/km²)
Time zone Central: UTC-6/-5
Named for: Henry Clay

Clay County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 13,815. Its county seat is Louisville.

In 1950, the U.S. Census Bureau placed the mean center of U.S. population in Clay County.

History

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. Clay was an unsuccessful candidate for President in the year the County was named.

Geography

According to the U.S. Census Bureau, the county has a total area of 470 square miles (1,200 km2), of which 468 square miles (1,210 km2) is land and 1.3 square miles (3.4 km2) (0.3%) is water.

Adjacent counties

Major highways

  • I-57.svg I-57
  • US 45.svg US 45
  • US 50.svg US 50
  • Illinois 37.svg IL 37

Climate and weather

Weather chart for Louisville, Illinois
J F M A M J J A S O N D
 
 
2.7
 
38
21
 
 
2.5
 
44
25
 
 
4
 
55
34
 
 
4.1
 
67
43
 
 
4.3
 
76
53
 
 
4.3
 
85
62
 
 
3.9
 
89
65
 
 
3.3
 
87
63
 
 
3.2
 
80
56
 
 
3
 
69
45
 
 
4.1
 
55
35
 
 
3.4
 
43
25
temperatures in °F
precipitation totals in inches
source: The Weather Channel

In recent years, average temperatures in the county seat of Louisville have ranged from a low of 21 °F (−6 °C) in January to a high of 89 °F (32 °C) in July, although a record low of −25 °F (−32 °C) was recorded in January 1904 and a record high of 111 °F (44 °C) was recorded in July 1936. Average monthly precipitation ranged from 2.49 inches (63 mm) in February to 4.34 inches (110 mm) in June.

Demographics

USA Clay County, Illinois age pyramid
2000 census age pyramid for Clay County
Historical population
Census Pop.
1830 755
1840 3,228 327.5%
1850 4,289 32.9%
1860 9,336 117.7%
1870 15,875 70.0%
1880 16,192 2.0%
1890 16,772 3.6%
1900 19,553 16.6%
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%
2010 13,815 −5.1%
Est. 2015 13,428 −2.8%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2013

As of the 2010 United States Census, there were 13,815 people, 5,697 households, and 3,790 families residing in the county. The population density was 29.5 inhabitants per square mile (11.4/km2). There were 6,404 housing units at an average density of 13.7 per square mile (5.3/km2). The racial makeup of the county was 97.7% white, 0.5% Asian, 0.3% black or African American, 0.2% American Indian, 0.5% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 1.1% of the population. In terms of ancestry, 21.7% were German, 14.6% were American, 12.6% were Irish, and 8.6% were English.

Of the 5,697 households, 29.5% had children under the age of 18 living with them, 52.1% were married couples living together, 9.4% had a female householder with no husband present, 33.5% were non-families, and 28.9% of all households were made up of individuals. The average household size was 2.37 and the average family size was 2.89. The median age was 42.2 years.

The median income for a household in the county was $38,016 and the median income for a family was $48,659. Males had a median income of $38,191 versus $27,347 for females. The per capita income for the county was $20,802. About 11.2% of families and 16.3% of the population were below the poverty line, including 21.4% of those under age 18 and 14.7% of those age 65 or over.

Communities

Cities

Villages

Townships

Clay County is divided into these twelve townships:

  • Bible Grove
  • Blair
  • Clay City
  • Harter
  • Hoosier
  • Larkinsburg
  • Louisville
  • Oskaloosa
  • Pixley
  • Songer
  • Stanford
  • Xenia

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