Key facts
- Country
- United States
- State
- New Mexico
- Named after
- location on the upper Rio Grande ( río arriba means "upriver" in Spanish)
- Seat
- Tierra Amarilla
- Largest city
- Española
- County manager
- Jeremy G. Maestas
- Total
- 5,896 sq mi (15,270 km )
- Land
- 5,861 sq mi (15,180 km )
- Water
- 35 sq mi (91 km ) 0.6%
- Estimate 2025
- 39,832
- Density
- 6.887/sq mi (2.659/km )
- Time zone
- UTC−7 ( Mountain )
- Summer dst
Article
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, New Mexico, micropolitan statistical area, which is also included in the Albuquerque–Santa Fe–Los Alamos combined statistical area.