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The total population of Rio Arriba County is estimated to be 40,285 with 19,854 males (49.28%) and 20,431 females (50.72%). There are 577 more females than males in Rio Arriba County.
In 2022, the population of Rio Arriba County was 40,048, a 0.50% decrease year-by-year from 2021. Previously, in 2021, Rio Arriba County's population was 40,249, a decline of 0.05% compared to a population of 40,269 in 2020.
The median age in Rio Arriba County, NM is 41.5, as per 2021 ACS 5-Year Estimates. Of the total population, 19.07% were under the age of 15, 17.78% aged 15 to 29, 43.63% aged 30 to 64, 17.21% aged 65 to 84, and 2.31% were 85 years of age and older.
Racial distribution of Rio Arriba County population: 41.39% are White, 0.56% are Black or African American, 15.81% are American Indian and Alaska Native, 0.51% are Asian, 0.02% are Native Hawaiian and other Pacific Islander, 27.38% are some other race and 14.34% are multiracial.