Resident Population in Rio Grande County, CO was 11.18800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Rio Grande County, CO reached a record high of 12.41700 in January of 2000 and a record low of 10.40000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Rio Grande County, CO - last updated from the United States Federal Reserve on May of 2024.