Rio Arriba County

Rio Arriba County is a county in northern New Mexico with mountains, lakes, and expansive terrain across thousands of square miles. The landscape is defined by high peaks and river valleys, with Abiquiu Lake and multiple mountain summits shaping the natural geography.

The county was established in 1852 and takes its name from its location along the upper Rio Grande river system. Its original territory was much larger, stretching far westward before boundary changes reduced its size.

The Hispano heritage shapes the region through local music traditions and celebrations that bring communities together throughout the year. These cultural practices remain visible in festivals, family gatherings, and everyday life across the county's villages.

Tierra Amarilla serves as the county seat where visitors can find local services and information. The area is best explored by car since communities are spread across large distances.

The Cumbres & Toltec Scenic Railroad connects the area to Colorado by running historic train lines through mountain passages and valleys. Visitors can experience this rail route that has been enjoyed for generations.

Location: New Mexico

Inception: 1852

Capital city: Tierra Amarilla

Shares border with: Archuleta County, Sandoval County, Santa Fe County, Los Alamos County, San Juan County, Mora County, Taos County, Conejos County

Website: http://rio-arriba.org

GPS coordinates: 36.51000,-106.70000

Latest update: December 20, 2025 00:14