Union County
Also known as Union County, New Mexico, Union County, NM
county in New Mexico, United States
Key facts
- Country
- United States
- State
- New Mexico
- Founded
- January 1, 1894
- Seat
- Clayton
- Largest town
- Clayton
- Total
- 3,831 sq mi (9,920 km )
- Land
- 3,824 sq mi (9,900 km )
- Water
- 7.1 sq mi (18 km ) 0.2%
- Estimate 2025
- 3,844
- Density
- 1.1/sq mi (0.42/km )
- Time zone
- UTC−7 ( Mountain )
- Summer dst
- UTC−6 ( MDT )
- Congressional district
- 3rd
Article
Union County (Spanish: Condado de la Unión) is the easternmost county in the U.S. state of New Mexico. As of the 2020 census, the population was 4,079, making it the fourth-least populous county in New Mexico. Its county seat is Clayton. The county was formed in 1894. Union County borders Colorado to the north, and Oklahoma and Texas to the east.
History