Resident Population in Routt County, CO was 25.24300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Routt County, CO reached a record high of 25.57900 in January of 2019 and a record low of 6.59200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Routt County, CO - last updated from the United States Federal Reserve on April of 2026.