Resident Population in Rio Arriba County, NM was 39.87600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Rio Arriba County, NM reached a record high of 41.22300 in January of 2000 and a record low of 25.17000 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Rio Arriba County, NM - last updated from the United States Federal Reserve on May of 2024.