Union County | |
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![]() Union County Courthouse in Clayton | |
![]() Location within the U.S. state of New Mexico | |
![]() New Mexico's location within the U.S. | |
Coordinates: 36°29′N 103°28′W / 36.48°N 103.47°W | |
Country | ![]() |
State | ![]() |
Founded | January 1, 1894 |
Seat | Clayton |
Largest town | Clayton |
Area | |
• Total | 3,831 sq mi (9,920 km2) |
• Land | 3,824 sq mi (9,900 km2) |
• Water | 7.1 sq mi (18 km2) 0.2% |
Population (2020) | |
• Total | 4,079 |
• Density | 1.1/sq mi (0.41/km2) |
Time zone | UTC−7 (Mountain) |
• Summer (DST) | UTC−6 (MDT) |
Congressional district | 3rd |
Website | unionnm |
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,[1] making it the fourth-least populous county in New Mexico. Its county seat is Clayton.[2] The county was formed in 1894.[3] Union County borders Colorado to the north, and Oklahoma and Texas to the east.