Clark County, Illinois

	█ Average max. and min. temperatures in °F
	█ Precipitation totals in inches
	Source: The Weather Channel

Marshall, Illinois
Climate chart (explanation)
	█ Average max. and min. temperatures in °F
	█ Precipitation totals in inches
	Source: The Weather Channel
Metric conversion
	█ Average max. and min. temperatures in °C
	█ Precipitation totals in mm

Clark County
Clark County
County
	Clark County Courthouse in Marshall
	Location within the U.S. state of Illinois
	Illinois's location within the U.S.
	Coordinates: 39°20′N 87°47′W / 39.33°N 87.79°W
Country	United States
State	Illinois
Founded	1819
Named for	George Rogers Clark
Seat	Marshall
Largest city	Marshall
Area
• Total	505 sq mi (1,310 km2)
• Land	501 sq mi (1,300 km2)
• Water	3.4 sq mi (9 km2) 0.7%
Population (2020)
• Total	15,455
• Density	31/sq mi (12/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	12th
Website	www.clarkcountyil.org

Clark County is a county located in the southeastern part of U.S. state of Illinois, along the Indiana state line. As of the 2020 census, the population was 15,455.^[1] Its county seat is Marshall.^[2] The county was named for George Rogers Clark, an officer who served in the American Revolution.^[3]

History

Clark County was formed in 1819 out of Crawford County. At the time of its formation, Clark County included about a third of Illinois, and extended as far north as the present state of Wisconsin. In 1821 the northern part of Clark County became part of the newly created Pike County on January 31, and the newly created Fayette County took the western part of Clark County on February 14. Edgar County was created from the northern part of Clark County on January 3, 1823. The creation of Coles County occupied additional land from western Clark County, effective December 25, 1830.^[4] The boundaries of Clark County have been unchanged since.

Clark County was named for George Rogers Clark^[5] (older brother of William Clark of the Lewis and Clark Expedition), an officer of the army of Virginia that captured the Northwest Territory from the British during the Revolutionary War.

Clark County from the time of its creation to 1821
Clark between 1821 and 1823
Clark between 1823 and 1830
Clark reduced to its current size in 1830 by the creation of Coles County

The county seat was located in Darwin Township in 1823. A county-wide referendum was held In 1839 to determine whether Auburn or Marshall would be designated as the new seat. Marshall won the election and has remained the county seat since then.^[6]

Geography

According to the U.S. Census Bureau, the county has a total area of 505 square miles (1,310 km²), of which 501 square miles (1,300 km²) is land and 3.4 square miles (8.8 km²) (0.7%) is water.^[7] Part of the county's eastern border is defined by the Wabash River. The North Fork of the Embarras River and Hurricane Creek are the main streams in western Clark County. Other than the Wabash River, Big Creek is the major stream in the eastern part of the county.^[8]

Adjacent counties

Edgar County - north
Vigo County, Indiana - northeast
Sullivan County, Indiana - southeast
Crawford County - south
Jasper County - southwest
Cumberland County - west
Coles County - northwest

Transit

Rides Mass Transit District

Major highways

Climate and weather

In recent years, average temperatures in the county seat of Marshall have ranged from a low of 16 °F (−9 °C) in January to a high of 86 °F (30 °C) in July, although a record low of −23 °F (−31 °C) was recorded in January 1930 and a record high of 109 °F (43 °C) was recorded in July 1936. Average monthly precipitation ranged from 2.23 inches (57 mm) in January to 4.43 inches (113 mm) in July.^[9]

Demographics

Historical population
Census	Pop.	Note	%±
1820	931		—
1830	3,940		323.2%
1840	7,453		89.2%
1850	9,532		27.9%
1860	14,987		57.2%
1870	18,709		24.8%
1880	21,894		17.0%
1890	21,899		0.0%
1900	24,033		9.7%
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%
2010	16,335		−4.0%
2020	15,455		−5.4%
2023 (est.)	15,088	^[10]	−2.4%
U.S. Decennial Census^[11] 1790-1960^[12] 1900-1990^[13] 1990-2000^[14] 2010^[15]

As of the 2010 United States Census, there were 16,335 people, 6,782 households, and 4,593 families residing in the county.^[16] The population density was 32.6 inhabitants per square mile (12.6/km²). There were 7,772 housing units at an average density of 15.5 per square mile (6.0/km²).^[7] The racial makeup of the county was 98.1% white, 0.3% black or African American, 0.3% Asian, 0.2% American Indian, 0.3% from other races, and 0.7% from two or more races. Those of Hispanic or Latino origin made up 1.1% of the population.^[16] In terms of ancestry, 27.4% were German, 14.2% were Irish, 14.2% were English, and 10.8% were American.^[17]

Of the 6,782 households, 30.3% had children under the age of 18 living with them, 53.5% were married couples living together, 9.7% had a female householder with no husband present, 32.3% were non-families, and 27.7% of all households were made up of individuals. The average household size was 2.38 and the average family size was 2.87. The median age was 42.3 years.^[16]

The median income for a household in the county was $43,597 and the median income for a family was $52,689. Males had a median income of $39,385 versus $27,426 for females. The per capita income for the county was $23,173. About 7.6% of families and 10.9% of the population were below the poverty line, including 15.3% of those under age 18 and 9.8% of those age 65 or over.^[18]

Education

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

Communities

Cities

Village

Westfield

Census designated places

West Union

Unincorporated communities

Townships

Clark County is divided into fifteen townships:

Former Settlement

Griffin

Politics

In its early days, Clark County favored the Democratic Party, not supporting a Republican presidential candidate until Theodore Roosevelt’s 1904 landslide. Since 1920, it has been a strongly Republican county: the last Democrat to win a majority being Lyndon Johnson in 1964, and only Bill Clinton by plurality in 1992 has won the county since.

United States presidential election results for Clark County, Illinois^[19]
Year	Republican		Democratic		Third party(ies)
Year	No.	%	No.	%	No.	%
2020	6,226	74.39%	1,993	23.81%	150	1.79%
2016	5,622	70.91%	1,877	23.68%	429	5.41%
2012	5,144	65.23%	2,591	32.86%	151	1.91%
2008	4,409	53.04%	3,742	45.02%	161	1.94%
2004	5,082	63.47%	2,877	35.93%	48	0.60%
2000	4,398	58.55%	2,932	39.03%	182	2.42%
1996	3,409	47.22%	2,995	41.48%	816	11.30%
1992	3,175	39.79%	3,338	41.83%	1,466	18.37%
1988	4,508	57.71%	3,275	41.93%	28	0.36%
1984	5,318	63.45%	3,032	36.17%	32	0.38%
1980	5,476	63.19%	2,855	32.94%	335	3.87%
1976	4,506	52.26%	4,071	47.22%	45	0.52%
1972	5,706	65.74%	2,965	34.16%	9	0.10%
1968	4,809	56.08%	2,813	32.80%	953	11.11%
1964	4,403	49.66%	4,464	50.34%	0	0.00%
1960	5,319	57.36%	3,949	42.59%	5	0.05%
1956	5,451	60.74%	3,519	39.21%	4	0.04%
1952	5,700	61.12%	3,621	38.83%	5	0.05%
1948	4,477	53.92%	3,714	44.73%	112	1.35%
1944	5,373	59.41%	3,619	40.02%	52	0.57%
1940	5,976	55.15%	4,807	44.36%	53	0.49%
1936	5,426	47.96%	5,836	51.58%	52	0.46%
1932	4,148	41.98%	5,659	57.27%	74	0.75%
1928	5,632	60.64%	3,621	38.99%	35	0.38%
1924	4,731	51.55%	4,203	45.79%	244	2.66%
1920	5,312	55.35%	4,181	43.57%	104	1.08%
1916	4,936	47.25%	5,311	50.84%	199	1.91%
1912	1,897	34.17%	2,517	45.34%	1,138	20.50%
1908	3,158	51.26%	2,793	45.33%	210	3.41%
1904	2,886	52.70%	2,271	41.47%	319	5.83%
1900	2,929	47.78%	3,009	49.09%	192	3.13%
1896	2,888	47.66%	3,103	51.20%	69	1.14%
1892	2,181	41.88%	2,244	43.09%	783	15.03%