|Knox County, Texas|
The Knox County Courthouse in Benjamin
Location in the U.S. state of Texas
Texas's location in the U.S.
|Named for||Henry Knox|
|• Total||855 sq mi (2,214 km2)|
|• Land||851 sq mi (2,204 km2)|
|• Water||4.9 sq mi (13 km2), 0.6%|
|• ( 2010)||3,719|
|• Density||4.4/sq mi (1.7/km2)|
|Time zone||Central: UTC−6/ −5|
Knox County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 3,719.  Its county seat is Benjamin.  The county was created in 1858 and later organized in 1886.  It is named for Henry Knox, an American Revolutionary War general. 
- Foard County (north)
- Baylor County (east)
- Haskell County (south)
- King County (west)
- Stonewall County (southwest)
|U.S. Decennial Census
1850–2010  2010–2014 
As of the census  of 2000, there were 4,253 people, 1,690 households, and 1,166 families residing in the county. The population density was 5 people per square mile (2/km²). There were 2,129 housing units at an average density of 2 per square mile (1/km²). The racial makeup of the county was 74.35% White, 6.91% Black or African American, 1.08% Native American, 0.24% Asian, 0.09% Pacific Islander, 14.77% from other races, and 2.56% from two or more races. 25.09% of the population were Hispanic or Latino of any race.
There were 1,690 households out of which 30.70% had children under the age of 18 living with them, 56.00% were married couples living together, 9.90% had a female householder with no husband present, and 31.00% were non-families. 29.60% of all households were made up of individuals and 17.90% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 3.02.
In the county, the population was spread out with 27.70% under the age of 18, 5.60% from 18 to 24, 22.90% from 25 to 44, 21.00% from 45 to 64, and 22.70% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 89.40 males. For every 100 females age 18 and over, there were 87.80 males.
The median income for a household in the county was $25,453, and the median income for a family was $30,602. Males had a median income of $25,571 versus $20,865 for females. The per capita income for the county was $13,443. About 17.10% of families and 22.90% of the population were below the poverty line, including 35.20% of those under age 18 and 15.20% of those age 65 or over.
The following school districts serve Knox County:
- Benjamin ISD
- Crowell ISD (mostly in Foard County; small portion in King County)
- Knox City-O'Brien Consolidated ISD (partly in Haskell County)
- Munday Consolidated ISD (small portions in Haskell and Throckmorton counties)
- Seymour ISD (mostly in Baylor County)
The city of Goree in Knox County is the site of the annual Bobby Boatright Memorial Music Camp, an event for aspiring Western Swing musicians of all ages to showcase their musical talents. The camp's namesake was a fiddle player who was originally from Goree. The camp was profiled in a story that aired on July 21, 2010 on National Public Radio's Morning Edition program. 
- Dry counties
- National Register of Historic Places listings in Knox County, Texas
- Recorded Texas Historic Landmarks in Knox County
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- "Texas: Individual County Chronologies". Texas Atlas of Historical County Boundaries. The Newberry Library. 2008. Retrieved May 24, 2015.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Government Printing Office. p. 177.
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved May 2, 2015.
- "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 May 2, 2015.
- "Texas Almanac: Population History of Counties from 1850–2010" (PDF). Texas Almanac. Retrieved May 2, 2015.
- "American FactFinder". United States Census Bureau. Retrieved 2011-05-14.
- Highlights, transcript, and audio links to NPR story on the Bobby Boatright Memorial Music Camp that aired 07/21/10
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 2018-07-26.