|Oldham County, Texas|
Oldham County Courthouse, Vega
Location in the U.S. state of Texas
Texas's location in the U.S.
|• Total||1,501 sq mi (3,888 km2)|
|• Land||1,501 sq mi (3,888 km2)|
|• Water||0.9 sq mi (2 km2), 0.06%|
|• ( 2017)||2,114|
|• Density||1.4/sq mi (0.5/km2)|
|Time zone||Central: UTC−6/ −5|
Oldham County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 2,052.  Its county seat is Vega.  The county was created in 1876 and organized in 1881.  Oldham County is included in the Amarillo, TX Metropolitan Statistical Area.
Oldham County was formed in 1876 and organized in 1881, and named for Williamson Simpson Oldham, Sr., a Texas pioneer and Confederate Senator. At the time of its organization, nearly the entire county was a part of the XIT Ranch. The county seat was originally at the town of Tascosa, Texas, which in the 1880s was one of the largest towns in the Panhandle. As the railroads came through the county, however, they bypassed Tascosa; several new towns and farms sprang up along the rail lines, and by 1915 Tascosa had a courthouse and almost no residents; the county seat was moved to Vega that year.  Oldham County is primarily ranch and farm land, with many thousands of acres planted in wheat, the major crop. The county also has some petroleum production and large wind farms. In 1902, the Matador Ranch acquired the 210,000 acres (850 km2) Alamositas Ranch in Oldham County. At its peak, the Matador owned 90,000 cattle and had title to 879,000 acres (3,560 km2) of land in parts of four Texas counties. 
According to the U.S. Census Bureau, the county has a total area of 1,501 square miles (3,890 km2), of which 1,501 square miles (3,890 km2) is land and 0.9 square miles (2.3 km2) (0.06%) is water.  A southern strip of the county, including the county seat Vega, is located on top of the Llano Estacado (Staked Plains). The next approximately 12 miles slope down to the Canadian River. The former county seat of Tascosa is located at a crossing of the Canadian River north of Vega. The terrain then slopes up from the Canadian River, passing the county line at approximately 6 miles and reaching the top of the High Plains a further four miles north.
For years there has been a simmering dispute over a strip of land running north and south, including an abandoned part of Glenrio at the west end of Oldham County, as to which state it is lawfully a part of: Texas or New Mexico? The border between the two states was originally defined as the 103rd meridian, but the 1859 survey that was supposed to mark that boundary mistakenly set the border between 2.29 and 3.77 miles too far west of that line, making the current towns of Farwell, Texline and the east part of Glenrio appear to be within the State of Texas. New Mexico's short border with Oklahoma, in contrast, was surveyed on the correct meridian. New Mexico's draft constitution in 1910 stated that the border is on the 103rd meridian as intended. The disputed strip, hundreds of miles long, includes parts of valuable oilfields of the Permian Basin. A bill was passed in the New Mexico Senate to fund and file a lawsuit in the U.S. Supreme Court to recover the strip from Texas, but the bill did not become law. Today, land in the strip is included in Texas land surveys and the land and towns (the east part of Glenrio in Deaf Smith and Oldham Counties) for all purposes are taxed and governed by the State of Texas. 
- Hartley County (north)
- Moore County (northeast)
- Potter County (east)
- Deaf Smith County (south)
- Quay County, New Mexico (west/ Mountain Time Zone)
- Randall County (southeast)
|U.S. Decennial Census
1850–2010  2010–2014 
As of the census  of 2000, there were 2,185 people, 735 households, and 565 families residing in the county. The population density was 2 people per square mile (1/km²). There were 815 housing units at an average density of 0 per square mile (0/km²). The racial makeup of the county was 90.66% White, 1.88% Black or African American, 1.28% Native American, 0.37% Asian, 4.62% from other races, and 1.19% from two or more races. 11.03% of the population were Hispanic or Latino of any race. In terms of ancestry, 25.2% were of German, 14.1% were of Irish, 10.4% were of English, 4,7% were of American, 3,3% were of French, 2,9% were of Dutch.
There were 735 households out of which 35.10% had children under the age of 18 living with them, 66.70% were married couples living together, 8.80% had a female householder with no husband present, and 23.00% were non-families. 21.00% of all households were made up of individuals and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.02.
In the county, the population was spread out with 35.00% under the age of 18, 7.20% from 18 to 24, 23.30% from 25 to 44, 23.20% from 45 to 64, and 11.30% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 108.10 males. For every 100 females age 18 and over, there were 90.60 males.
The median income for a household in the county was $33,713, and the median income for a family was $39,091. Males had a median income of $26,845 versus $20,185 for females. The per capita income for the county was $14,806. About 10.50% of families and 19.80% of the population were below the poverty line, including 20.00% of those under age 18 and 7.90% of those age 65 or over.
- W. D. Twichell, surveyor and civil engineer
- Cal Farley, professional wrestler and Boys Ranch founder
- Sam Brown, American Cowboy Novelist
- Rory Schepisi, CMT's Popularity Contest Star, Food Network Star, Appeared on rachel ray, The Today Show, Dr Oz, TLC, and Studio 4 KAMR Amarillo celebrity chef
Magnolia Station, a U.S. Route 66 roadside attraction near the Oldham County Courthouse in Vega
Chamber of Commerce office and emblem in Vega
Wildorado Wind Ranch in Oldham County as photographed from Route 385
In presidential elections, Oldham County is solidly Republican.
- List of museums in the Texas Panhandle
- National Register of Historic Places listings in Oldham County, Texas
- Recorded Texas Historic Landmarks in Oldham County
- "State & County QuickFacts". United States Census Bureau. Archived from the original on July 15, 2011. Retrieved December 22, 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 May 26, 2015.
- Nolan, Frederick. (2007) Tascosa: It's Life and Guady Times. Texas Tech University Press 
- " Matador Ranch," Historical marker, Texas Historical Commission, Motley County, Texas
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved May 5, 2015.
- Daniel Gertson. "Border War Brewing?". Retrieved 2018-07-20.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "U.S. Decennial Census". United States Census Bureau. Retrieved May 5, 2015.
- "Texas Almanac: Population History of Counties from 1850–2010" (PDF). Texas Almanac. Retrieved May 5, 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 2018-07-28.
- Oldham County government's website
- Oldham County in Handbook of Texas Online at the University of Texas
- Oldham County Profile from the Texas Association of Counties