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Clay County, Illinois facts for kids

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Clay County
Clay County Courthouse in Louisville
Map of Illinois highlighting Clay County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Country  United States
State  Illinois
Founded 23 December 1824 (created)
8 March 1825 (organized)
Named for Henry Clay
Seat Louisville
Largest city Flora
Area
 • Total 469.59 sq mi (1,216.2 km2)
 • Land 468.32 sq mi (1,212.9 km2)
 • Water 1.28 sq mi (3.3 km2)  0.3%
Population
 (2010)
 • Total 13,815
 • Estimate 
(2019)
13,184
 • Density 28.3/sq mi (10.9/km2)
Time zone UTC−6 (Central)
 • Summer (DST) UTC−5 (CDT)
Congressional district 15th

Clay County is a county in the U.S. state of Illinois. As of the 2010 United States Census, the population was 13,815. Since 1842, its county seat has been Louisville, in the center of the county's area.

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

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%
2019 (est.) 13,184 −4.6%
US Decennial Census
1790-1960 1900-1990
1990-2000 2010-2013
USA Clay County, Illinois age pyramid
2000 census age pyramid for Clay County

2010 census

As of the 2010 United States Census, there were 13,815 people, 5,697 households, and 3,790 families 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

Education

  • Clay City Community Unit District 10
  • Dieterich Community Unit School District 30
  • Effingham Community Unit School District 40
  • Flora Community Unit School District 35
  • Jasper County Community Unit School District 1
  • North Clay Community Unit School District 25
    • North Clay High School
  • South Central Community Unit School District 401
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