Union County, New Mexico

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Union County, New Mexico
Union County Court House.jpg
Map of New Mexico highlighting Union County
Location in the state of New Mexico
Map of the United States highlighting New Mexico
New Mexico's location in the U.S.
Founded 1893
Seat Clayton
Largest town Clayton
 • Total 3,831 sq mi (9,922 km2)
 • Land 3,824 sq mi (9,904 km2)
 • Water 7 sq mi (18 km2), 0.2%
 • (2010) 4,549
 • Density 1/sq mi (.45/km²)
Congressional district 3rd
Time zone Mountain: UTC-7/-6

Union County is the northernmost county in the U.S. state of New Mexico. As of the 2010 census, the population was 4,549.[1] Its county seat is Clayton.[2] Union County borders Colorado to the north, and Oklahoma and Texas to the east.


Union County, was created by an act of the territorial legislation in 1893 and was officially recognized on January 1, 1894, when the first slate of elected county officials received their oaths of office. The county is named “Union” because the citizens were united in their desire for the creation of a new county out of three existing New Mexico counties. Union County was subsequently “carved up” by the creation of additional counties, Quay in 1903 and Harding in 1920. At one time, Union County had a population of over 20,000. There were a number of bustling communities such as Amistad, Hayden, Sedan, Pasamonte, Gladstone, Mt Dora, Grenville, Des Moines, Folsom and Dedman (now known as Capulin).


According to the U.S. Census Bureau, the county has a total area of 3,831 square miles (9,920 km2), of which 3,824 square miles (9,900 km2) is land and 7-square-mile (18 km2) (0.2%) is water.[3]

Adjacent counties[edit]

Union County is one of the few counties in the U.S. to border counties from four different states. One of its neighbors is Cimarron County, Oklahoma, the only US county to border counties from five different states.

National protected areas[edit]


Historical population
Census Pop.
1910 11,404
1920 16,680 46.3%
1930 11,036 −33.8%
1940 9,095 −17.6%
1950 7,372 −18.9%
1960 6,068 −17.7%
1970 4,925 −18.8%
1980 4,725 −4.1%
1990 4,124 −12.7%
2000 4,174 1.2%
2010 4,549 9.0%
Est. 2012 4,431 −2.6%
U.S. Decennial Census[4]
2012 Estimate[1]


Whereas according to the 2010 U.S. Census Bureau:


As of the census[5] of 2000, there were 4,174 people, 1,733 households, and 1,176 families residing in the county. The population density was 1.1 people per square mile (0.4/km²). There were 2,225 housing units at an average density of 1 per square mile (0/km²). The racial makeup of the county was 80.38% White, 0.96% Native American, 0.34% Asian, 0.12% Pacific Islander, 16.00% from other races, and 2.20% from two or more races. 35.10% of the population were Hispanic or Latino of any race.

There were 1,733 households out of which 31.10% had children under the age of 18 living with them, 54.70% were married couples living together, 9.10% had a female householder with no husband present, and 32.10% were non-families. 30.00% of all households were made up of individuals and 14.90% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.99.

In the county the population was spread out with 27.30% under the age of 18, 6.30% from 18 to 24, 24.60% from 25 to 44, 24.10% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 97.00 males. For every 100 females age 18 and over, there were 96.30 males.

The median income for a household in the county was $28,080, and the median income for a family was $35,313. Males had a median income of $26,364 versus $18,711 for females. The per capita income for Union county was $14,700. About 14.20% of families and 18.10% of the population were below the poverty line, including 31.40% of those under age 18 and 8.30% of those age 65 or over.




Other communities[edit]

See also[edit]


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved September 30, 2013. 
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011. 
  3. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. February 12, 2011. Retrieved April 23, 2011. 
  4. ^ "U.S. Decennial Census". Census.gov. Retrieved September 30, 2013. 
  5. ^ "American FactFinder". United States Census Bureau. Retrieved January 31, 2008. 

External links[edit]

Coordinates: 36°29′N 103°28′W / 36.48°N 103.47°W / 36.48; -103.47