|Lamar County, Texas|
The Lamar County Courthouse in Paris
Location in the U.S. state of Texas
Texas's location in the U.S.
|Named for||Mirabeau Buonaparte Lamar|
|• Total||933 sq mi (2,416 km2)|
|• Land||907 sq mi (2,349 km2)|
|• Water||26 sq mi (67 km2), 2.8%|
|• ( 2010)||50,026 (as of 2,018)|
|• Density||55/sq mi (21/km2)|
|Time zone||Central: UTC−6/ −5|
Lamar County is a county located in the U.S. state of Texas, up in the Northeast Texas region of the state. As of the 2010 census, its population was 49,891.  Its county seat is Paris.  The county was formed by the Congress of the Republic of Texas on December 17, 1840 and organized the next year.   It is named for Mirabeau Buonaparte Lamar, the second president of the Republic of Texas. 
Lamar County comprises the Paris, TX Micropolitan Statistical Area.
The majority-white population supported the Democratic Party well into the late 20th century, when it was nearly a one-party state. But in the early 21st century, most have shifted to the Republican Party. Lamar County is now represented in the Texas House of Representatives by Gary VanDeaver of New Boston, Texas.  Republican US Representative Marsha Farney, reared in Lamar County, represents District 20, which includes the northern portion of Williamson County in the Austin suburbs.
- Choctaw County, Oklahoma (north)
- Red River County (east)
- Delta County (south)
- Fannin County (west)
- Bryan County, Oklahoma (northwest)
|U.S. Decennial Census
1850–2010  2010–2014 
As of the census  of 2000, there were 48,499 people, 19,077 households, and 13,468 families residing in the county. The population density was 53 people per square mile (20/km²). There were 21,113 housing units at an average density of 23 per square mile (9/km²). The racial makeup of the county was 82.46% White, 13.47% Black or African American, 1.08% Native American, 0.40% Asian, 0.02% Pacific Islander, 1.17% from other races, and 1.41% from two or more races. 3.33% of the population were Hispanic or Latino of any race.
There were 19,077 households out of which 32.30% had children under the age of 18 living with them, 54.00% were married couples living together, 13.20% had a female householder with no husband present, and 29.40% were non-families. 26.10% of all households were made up of individuals and 12.30% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.99.
In the county, the population was spread out with 26.10% under the age of 18, 8.60% from 18 to 24, 26.80% from 25 to 44, 22.90% from 45 to 64, and 15.60% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 91.30 males. For every 100 females age 18 and over, there were 86.80 males.
The median income for a household in the county was $31,609, and the median income for a family was $38,359. Males had a median income of $30,539 versus $21,095 for females. The per capita income for the county was $17,000. About 12.80% of families and 16.40% of the population were below the poverty line, including 22.50% of those under age 18 and 14.30% of those age 65 or over.
The following school districts serve Lamar County:
- Chisum ISD (small portion in Delta County)
- Fannindel ISD (mostly in Delta and Fannin counties; small portion in Hunt County)
- Honey Grove ISD (mostly in Fannin County)
- North Lamar ISD
- Paris ISD
- Prairiland ISD (small portion in Red River County)
- Roxton ISD
In addition, Paris Junior College serves the county.
- National Register of Historic Places listings in Lamar County, Texas
- Recorded Texas Historic Landmarks in Lamar County
- Lamar County Historical Museum
- "State & County QuickFacts". United States Census Bureau. Archived from the original on July 13, 2011. Retrieved December 19, 2013.
- "Find a County". National Association of Counties. Retrieved 2011-06-07.
- "Texas: Individual County Chronologies". Texas Atlas of Historical County Boundaries. The Newberry Library. 2008. Retrieved June 20, 2015.
- "Lamar County". Texas Almanac. Texas State Historical Association. 2015-05-22. Retrieved June 20, 2015.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Government Printing Office. p. 180.
- "Texas House of Representatives".
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved May 3, 2015.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "U.S. Decennial Census". United States Census Bureau. Retrieved May 3, 2015.
- "Texas Almanac: Population History of Counties from 1850–2010" (PDF). Texas Almanac. Retrieved May 3, 2015.
- "American FactFinder". United States Census Bureau. Retrieved 2011-05-14.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 2018-07-26.
Media related to Lamar County, Texas at Wikimedia Commons
- Lamar County government's website
- Lamar County in Handbook of Texas Online at the University of Texas
- Historic Lamar County materials, hosted by the Portal to Texas History
- Lamar County Texas information - Lamar County Station