Rio Arriba County, New Mexico

Rio Arriba County
Rio Arriba County Courthouse, Isaac Rapp, architect, 1916-17
Location within the U.S. state of New Mexico
New Mexico's location within the U.S.
Coordinates: 36°31′N 106°42′W / 36.51°N 106.7°W / 36.51; -106.7
Country United States
State New Mexico
Founded1852
Named afterlocation on the upper Rio Grande (río arriba means "upriver" in Spanish)
SeatTierra Amarilla
Largest cityEspañola
Government
  County ManagerJeremy G. Maestas
Area
  Total
5,896 sq mi (15,270 km2)
  Land5,861 sq mi (15,180 km2)
  Water35 sq mi (90 km2)  0.6%
Population
 (2020)
  Total
40,363
  Density6.8/sq mi (2.6/km2)
Time zoneUTC−7 (Mountain)
  Summer (DST)UTC−6 (MDT)
Congressional district3rd
Websitewww.rio-arriba.org

Rio Arriba County (Spanish: Condado de Río Arriba) is a county in the U.S. state of New Mexico. As of the 2020 census, the population was 40,363. Its county seat is Tierra Amarilla. Its northern border is the Colorado state line.

Rio Arriba County comprises the Española, NM Micropolitan Statistical Area, which is also included in the Albuquerque-Santa Fe-Las Vegas, NM Combined Statistical Area.