| Name | Rio Arriba County |
| State | New Mexico |
| FIPS Code | 35039 |
| County Seat | Tierra Amarilla |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 39,921 |
| Population Growth Rate(2020-2024) | -1.09% |
| Majority Ethnicity | Hispanic 59.33% |
| Public School Majority Ethnicity | Hispanic 77% |
| Partisan Voting Index | Democratic:+13 |
| Unemployment Rate (May 2026) | 5.0% |
| Sales Tax Rate (2025) | 6.63% |
| Area Code(s) | 575 / 505 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 24.61% |
| African American | 0.66% |
| Hispanic | 59.33% |
| Asian | 0.52% |
| Native American | 14.75% |
| Hawaiin/Pacific Islander | 0.14% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 2.91% |
| African American | 0.4% |
| Hispanic | 76.63% |
| Asian | 0.87% |
| Native American | 18.29% |
| Hawaiin/Pacific Islander | 0.08% |