|Clay County, Texas|
Location in the U.S. state of Texas
Texas's location in the U.S.
|Named for||Henry Clay|
|• Total||1,117 sq mi (2,893 km2)|
|• Land||1,089 sq mi (2,820 km2)|
|• Water||28 sq mi (73 km2), 2.5%|
|• ( 2010)||10,752|
|• Density||9.9/sq mi (3.8/km2)|
|Time zone||Central: UTC−6/ −5|
Clay County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 10,752.  The county seat is Henrietta.  The county was founded in 1857 and later organized in 1860.  It is named in honor of Henry Clay,  famous American statesman, Kentucky Senator and United States Secretary of State.
Several railroads once served Clay County, including the Wichita Falls Railway, one of the properties of Joseph A. Kemp and his brother-in-law Frank Kell, along with twenty-nine other stockholders. The Wichita Falls Railway linked Henrietta with Wichita Falls. Built in 1894-1895, it was sold in 1911 to the Missouri-Kansas-Texas Railroad, also known as the Katy. The original eighteen miles of track was abandoned in 1970. 
Lake Arrowhead State Park, a 524-acre (212 ha) development on Lake Arrowhead in Clay County, encompasses 14,390-acre (5,820 ha) acres. The lakeshore extends 106 miles; the park offers bicycling, birding, boating, camping, canoeing, fishing, hiking, horseback riding, nature study, picnicking, swimming, and wildlife observation. 
- Jefferson County, Oklahoma (north)
- Montague County (east)
- Jack County (south)
- Wichita County (west)
- Archer County (west)
- Cotton County, Oklahoma (northwest)
|U.S. Decennial Census
1850–2010  2010–2014 
As of the census  of 2000, there were 11,006 people, 4,323 households, and 3,181 families residing in the county. The population density was 10 people per square mile (4/km²). There were 4,992 housing units at an average density of 4 per square mile (2/km²). The racial makeup of the county was 95.35% White, 0.42% Black or African American, 1.03% Native American, 0.10% Asian, 0.01% Pacific Islander, 1.68% from other races, and 1.42% from two or more races. 3.67% of the population were Hispanic or Latino of any race.
There were 4,323 households out of which 30.70% had children under the age of 18 living with them, 63.20% were married couples living together, 7.30% had a female householder with no husband present, and 26.40% were non-families. 23.50% of all households were made up of individuals and 11.80% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 2.98.
In the county, the population was spread out with 24.90% under the age of 18, 6.80% from 18 to 24, 26.40% from 25 to 44, 25.90% from 45 to 64, and 16.10% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 94.00 males. For every 100 females age 18 and over, there were 93.10 males.
The median income for a household in the county was $35,738, and the median income for a family was $41,514. Males had a median income of $28,914 versus $20,975 for females. The per capita income for the county was $16,361. About 8.10% of families and 10.30% of the population were below the poverty line, including 11.70% of those under age 18 and 11.00% of those age 65 or over.
- List of museums in North Texas
- National Register of Historic Places listings in Clay County, Texas
- Recorded Texas Historic Landmarks in Clay County
- "State & County QuickFacts". United States Census Bureau. Retrieved December 9, 2013.
- "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.
- "Texas: Individual County Chronologies". Texas Atlas of Historical County Boundaries. The Newberry Library. 2008. Retrieved May 21, 2015.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 83.
- "Wichita Falls Railway". tshaonline.org. 2010-06-15. Retrieved April 20, 2013.
- "Jack O. Loftin, "Joseph Sterling Bridwell"". Texas State Historical Association online. 2010-06-12. Retrieved April 30, 2013.
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved April 20, 2015.
- "Lake Arrowhead State Park". wildtexas.com. Retrieved April 17, 2013.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "U.S. Decennial Census". United States Census Bureau. Archived from the original on May 12, 2015. Retrieved April 20, 2015.
- "Texas Almanac: Population History of Counties from 1850–2010" (PDF). Texas Almanac. Retrieved April 20, 2015.
- "American FactFinder". United States Census Bureau. Archived from the original on 2013-09-11. Retrieved 2011-05-14.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 2018-07-20.
Media related to Clay County, Texas at Wikimedia Commons
- Clay County Official Website
- See historic photos of Clay County from the Clay County Historical Society, hosted by the Portal to Texas History
- Clay County from the Handbook of Texas Online
- Clay County 1890 Jail Museum-Heritage Center